Changes ACL permission setting hints

The default behavior of setfacl is to recalculate the ACL mask entry, unless a mask entry was explicitly given.
minor #3566 Changes ACL permission setting hints (MicheleOnGit)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #3566).

Discussion
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Changes ACL permission setting hints

The default behavior of setfacl is to recalculate the ACL mask entry, unless a mask entry was explicitly given.

Commits
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4480eff Changes ACL permission setting hints
Added February changelog
Merge branch '2.3' into 2.4
Created 2.4 CHANGELOG