Doc: Refactor CMake API documentation


Pick-to: 6.12
Change-Id: I415c6aec1fff47e017e965a2adac1922a60e9adf
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
commit595eaa3757510f6cd4a224b933686103eb613f0a
parenta05daca87d49261da219c1c09ab75a7f83dcd1db
authorKai Köhne <kai.koehne@qt.io>
committerKai Köhne <kai.koehne@qt.io>
commit timeFri, 12 Jun 2026 13:50:18 +0000