man: document the new RestrictSUIDSGID= setting
(cherry picked from commit 7445db6eb70e8d5989f481d0c5a08ace7047ae5b)
Related: #1687512
patch_name: 0327-man-document-the-new-RestrictSUIDSGID-setting.patch
present_in_specfile: true
location_in_specfile: 327
squash_commits: true