Merge topic 'doc-3.27-relnotes'

6bc97b453c Help: Update Sphinx versionadded directives for 3.27 release
78d2c9fef0 Help: Organize and revise 3.27 release notes
e6bcda8c39 Help: Consolidate 3.27 release notes

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8539