Merge topic 'doc-policies'

83b9029208 Help: Clarify standard policy advice paragraph wording on how policies are set
faa2bf22df Help: Drop current CMake version from standard policy advice paragraph
ad3c2c0b03 Help: Normalize and consolidate standard policy advice paragraph

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Mi-La <milan.kriz@eccam.com>
Acked-by: Robert Maynard <robertjmaynard@gmail.com>
Merge-request: !9149