When documenting a CMake command, document the unversioned command
'qt_foo' and use '\versionlessCMakeCommandNote qt6_foo' to refer to the
versioned command. This avoids duplicating the command signature.
Use the new macro where applicable.
Pick-to: 6.2
Task-number: QTBUG-95796
Change-Id: I2e4180fbda0b89acf3d8c036459f591eb2f46475
Reviewed-by: Craig Scott <craig.scott@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
c3308b13ca