Qt Charts: Add alt texts

qdoc: 'QtCharts': \image examples_areachart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_barchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_barmodelmapper.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_boxplotchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_callout.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_candlestickchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_chartthemes_light.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_chartthemes_brown_sand.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_chartthemes_blue_cerulean.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_customchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_datetimeaxis.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_donutbreakdown.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_horizontalbarchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_horizontalpercentbarchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_horizontalstackedbarchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_legend_detach.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_legend_detach2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_legendmarkers.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_lineandbar.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_linechart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_logvalueaxis.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_modeldata.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_multiaxis.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_nesteddonuts.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_openglseries.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_percentbarchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_pointconfiguration.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_pointsselectionandmarkers1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_pointsselectionandmarkers2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_polarchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_scatterchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_selectedbar.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_splinechart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_stackedbarchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_stackedbarchartdrilldown1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_stackedbarchartdrilldown2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_temperaturerecords.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image ChartWidgetGallery.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlaxes1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlaxes2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlaxes3.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlcustomizations.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlcustomlegend1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlcustomlegend2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlcustomlegend3.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlf1legends.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlpolarchart1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlpolarchart2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlpolarchart3.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image QMLChartsGallery.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart3.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart4.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart5.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart6.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart7.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart8.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart9.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart10.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart11.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlchart12.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image api_category_axis.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image api_datatime_axis.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlcandlestick.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_audio.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image dynamicwavform.gif is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmloscilloscope.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlweather.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_zoomlinechart1.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_zoomlinechart2.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_percentbarchart_legend.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_piechart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_donutchart.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image xyseries_point_configuration.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtCharts': \image examples_qmlboxplot.png is without a textual description, QDoc will not generate an alt text for the image.