Merge topic 'cmake-diagnostics-doc'

95f7f84609 Help: Fix CMD_INSTALL_ABSOLUTE_DESTINATION documentation
a882ec84ec cmDocumentation: Add diagnostics
97d13c3053 Help: Improve diagnostics documentation
3cccce8ca2 Help: Add developer documentation for new diagnostics
ffe4c2a8ff Help: Fix developer documentation

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Robert Maynard <robertjmaynard@gmail.com>
Merge-request: !11996