Update the autofs(5) manual to reflect it first appeared in
FreeBSD 10.1-RELEASE.

Submitted by:	dhw
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271043 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f