docs/156796: prototype fix in fls(3)

[delphij at FreeBSD.org]

Synopsis: prototype fix in fls(3)

Responsible-Changed-From-To: freebsd-doc->delphij
Responsible-Changed-By: delphij
Responsible-Changed-When: Tue May 3 19:33:30 UTC 2011
Responsible-Changed-Why: 
Take.

http://www.freebsd.org/cgi/query-pr.cgi?pr=156796