Qt Virtual Keyboard: Add alt texts

qdoc: 'QtVirtualKeyboard': \image handwriting.gif is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-sq_AL.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-ar_AR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-bg_BG.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-hr_HR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-cs_CZ.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-da_DK.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-nl_NL.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-en_GB.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-en_US.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-et_EE.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-fi_FI.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-fr_FR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-fr_CA.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-de_DE.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-el_GR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-he_IL.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-hi_IN.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-hu_HU.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-id_ID.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-it_IT.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-ja_JP.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-ko_KR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-ms_MY.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-nb_NO.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-fa_FA.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-pl_PL.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-pt_PT.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-pt_BR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-ro_RO.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-ru_RU.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-sr_SP.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-zh_CN.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-zh_TW.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-sk_SK.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-sl_SI.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-es_ES.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-es_MX.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-sv_SE.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-th_TH.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-tr_TR.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-uk_UA.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image layouts/qtvirtualkeyboard-layout-vi_VN.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image basic-example.webp is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image language-icon.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image handwriting-mode-icon.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image gesture-single-left.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image gesture-single-right.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image gesture-single-down-left.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image gesture-double-left.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image gesture-single-up.png is without a textual description, QDoc will not generate an alt text for the image.
qdoc: 'QtVirtualKeyboard': \image gesture-double-up.png is without a textual description, QDoc will not generate an alt text for the image.