Clean up some .Os macro uses: quotes are not needed, multiple arguments

don't really work if the first one isn't "FreeBSD", and "FreeBSD-Experimental"
isn't an OS name.

bin/domainname/domainname.1

@@ -30,11 +30,11 @@
 .\" SUCH DAMAGE.
 .\"
 .\"	From: @(#)hostname.1	8.1 (Berkeley) 5/31/93
-.\"	$Id: domainname.1,v 1.5 1997/06/03 06:19:04 charnier Exp $
+.\"	$Id: domainname.1,v 1.6 1998/05/13 07:37:23 charnier Exp $
 .\"
 .Dd September 18, 1994
 .Dt DOMAINNAME 1
-.Os "FreeBSD 2.0"
+.Os FreeBSD 2.0
 .Sh NAME
 .Nm domainname
 .Nd set or print name of current YP/NIS domain

libexec/atrun/atrun.man

@@ -1,7 +1,7 @@
-.\" $Id: atrun.man,v 1.4 1997/11/20 07:21:53 charnier Exp $
+.\" $Id: atrun.man,v 1.5 1998/07/01 05:47:58 jkoshy Exp $
 .Dd April 12, 1995
 .Dt ATRUN 8
-.Os "FreeBSD 2.1"
+.Os FreeBSD 2.1
 .Sh NAME
 .Nm atrun
 .Nd run jobs queued for later execution

libexec/xtend/xtend.8

@@ -27,12 +27,12 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$Id: xtend.8,v 1.8 1997/12/04 07:25:18 charnier Exp $
+.\"	$Id: xtend.8,v 1.9 1998/03/19 07:37:36 charnier Exp $
 .\"
 .Th XTEND 8 "30 Oct 1993"
 .Dd Oct 30, 1993
 .Dt XTEND 8
-.Os BSD FreeBSD
+.Os FreeBSD
 .Sh NAME
 .Nm xtend
 .Nd X-10 daemon

sys/modules/ibcs2/ibcs2.8

@@ -25,11 +25,11 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $Id: ibcs2.8,v 1.5 1998/05/19 03:31:34 jkoshy Exp $
+.\" $Id: ibcs2.8,v 1.6 1998/08/31 16:41:06 wosch Exp $
 .\"
 .Dd November 27, 1995
 .Dt IBCS2 8
-.Os FreeBSD-Experimental
+.Os FreeBSD
 .Sh NAME
 .Nm ibcs2
 .Nd load iBCS2 runtime support for SCO and ISC binaries

usr.bin/at/at.man

@@ -1,7 +1,7 @@
-.\" $Id: at.man,v 1.7 1998/03/23 07:40:30 charnier Exp $
+.\" $Id: at.man,v 1.8 1998/06/04 21:05:53 steve Exp $
 .Dd April 12, 1995
 .Dt "AT" 1
-.Os "FreeBSD 2.1"
+.Os FreeBSD 2.1
 .Sh NAME
 .Nm at, batch, atq, atrm
 .Nd queue, examine or delete jobs for later execution