Merge topic 'doc-cpackrpm-versionadded'

a7a499a459 Help: Add `versionadded` for `CPACK_RPM_REQUIRES_EXCLUDE_FROM` variable
3eefb78512 Help: Use lower-case names of sphinx directives

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !6684