\since says the macro is a function even if it isn't

The documentation of QT_NO_DEPRECATED_WARNINGS cheerily ends with

This function was introduced in Qt 5.13.

However, this \macro is in fact not a function, just a macro.
It takes no parameters and expands to an integer constant.
Frankly even if a macro is function-like, describing it here as a macro would be better than describing it as a function.
I suspect we could find other topics than \macro in which \since's text should not talk about a function; but my guess is that this is a fixed wording.
It would be better to adapt the wording of \since's message to the topic command to whose doc it relates.

While I'm here, if at all possible, even when it is a \fn, if it's actually a single QDoc comment covering several functions, then "These functions were" would be a better opening to the text.
By way of an example, see QDate::startOfDay().
For other topic types, likewise, it would make sense to use the plural form in the \since statement appropriate to the topic.