Various mdoc fixes.

Found with:	mandoc -Tlint

share/man/man5/periodic.conf.5

@@ -705,7 +705,7 @@ they will be always run unless their
 or
 .Va ..._period
 variable is set to
-.Dq No .
+.Dq NO .
 .Bl -tag -offset 4n -width 2n
 .It Va security_status_diff_flags
 .Pq Vt str

share/man/man5/pf.conf.5

@@ -28,7 +28,7 @@
 .\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 29 2012
+.Dd June 29, 2012
 .Dt PF.CONF 5
 .Os
 .Sh NAME

share/man/man5/pf.os.5

@@ -16,7 +16,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 31 2007
+.Dd May 31, 2007
 .Dt PF.OS 5
 .Os
 .Sh NAME
@@ -217,7 +217,7 @@ almost translates into the following fingerprint
   57344:64:1:44:M1460:	exampleOS:1.0::exampleOS 1.0
 .Ed
 .Sh SEE ALSO
+.Xr tcpdump 1 ,
 .Xr pf 4 ,
 .Xr pf.conf 5 ,
-.Xr pfctl 8 ,
-.Xr tcpdump 1
+.Xr pfctl 8

share/man/man5/rc.conf.5

@@ -4547,9 +4547,9 @@ ruleset to load for
 .Xr rfcomm_pppd 8 ,
 .Xr route 8 ,
 .Xr routed 8 ,
-.Xr rpcbind 8 ,
 .Xr rpc.lockd 8 ,
 .Xr rpc.statd 8 ,
+.Xr rpcbind 8 ,
 .Xr rwhod 8 ,
 .Xr savecore 8 ,
 .Xr sdpd 8 ,

share/man/man5/services.5

@@ -91,8 +91,8 @@ file resides in
 .Pa /etc .
 .El
 .Sh SEE ALSO
-.Xr getservent 3
-.Xr nsswitch.conf 5
+.Xr getservent 3 ,
+.Xr nsswitch.conf 5 ,
 .Xr services_mkdb 8
 .Sh HISTORY
 The