docs/128968: [patch] rwlock(9) man page typo

[maxim at FreeBSD.org]

Synopsis: [patch] rwlock(9) man page typo

State-Changed-From-To: open->patched
State-Changed-By: maxim
State-Changed-When: Tue Nov 18 20:12:03 UTC 2008
State-Changed-Why: 
The issue is already fixed in HEAD.  I'll MFC the delta
to RELENG_7 after 7.0-RELEASE if pjd@ doesn't do before me.

http://www.freebsd.org/cgi/query-pr.cgi?pr=128968