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objects with SF_IMMUTABLE, SF_APPEND, or SF_NOUNLINK. * Document that non-superusers cannot set or clear any SF_* flag (setting fails with EPERM, clearing is silently ignored). * Document that superusers cannot change any flag if one of SF_IMMUTABLE, SF_APPEND, SF_NOUNLINK is set and securelevel is greater than 0. * Document SF_SNAPSHOT and note that it is maintained by the system and is, for this reason, impossible to set to clear by any user. PR: docs/33877 Submitted by: harti Help by: George Marsellis <gam9478@njit.edu> MFC after: 1 week