docs/157452: [patch] grammar and style nits in ipfw.8

[eadler at FreeBSD.org]

Synopsis: [patch] grammar and style nits in ipfw.8

Responsible-Changed-From-To: freebsd-doc->eadler
Responsible-Changed-By: eadler
Responsible-Changed-When: Sun Mar 4 04:31:23 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=157452