Merge topic 'help-signatures'

8c52458a9e cmRST: Fix cmake domain directives with newline before argument
d4b21bcdd6 cmRST: Fix typo in comment
6a84717d17 cmRST: Convert enum types to enum class

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !8310