Document that REQUIRES, PROVIDES and KEYWORDS are alos accepted.  This chnage is different to the one suggested in the PR to try to avoid cluttering the man page too much.
Document that REQUIRES, PROVIDES and KEYWORDS are alos accepted.  This
chnage is different to the one suggested in the PR to try to avoid
cluttering the man page too much.

PR:		docs/154494
Submitted by:	kilian <kilian.klimek googlemail.com>
MFC after:	1 week

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