Merge branch 'jlopes-group-restriction-note' into 'master'

Docs: note that domain restrictions only apply to groups, not projects

See merge request gitlab-org/gitlab!52530

doc/user/group/index.md

@@ -706,6 +706,9 @@ To enable this feature:
 
 This will enable the domain-checking for all new users added to the group from this moment on.
 
+NOTE:
+Domain restrictions only apply to groups and do not prevent users from being added as members of projects owned by the restricted group.
+
 #### Group file templates **(PREMIUM)**
 
 Group file templates allow you to share a set of templates for common file