With new documentation UI, many code examples lack links to Qt symbols

Symbols in examples used to be clickable and take to the relevant documentation page for the symbols (C++ classes, QML types etc.). Now this only seems to happen for selected pages.

Positive example (QML types are clickable):

https://doc.qt.io/qt-5.15/qml-qtquick-controls2-action.html#details

Negative example (QML types are not clickable):

https://doc.qt.io/qt-5.15/qml-qtquick-controls2-button.html#details