ps.1: Fix unusual Xr order

bin/ps/ps.1

@@ -570,7 +570,7 @@ group name (from rgid)
 resident set size in KiB
 .It Cm rtprio
 realtime priority (see
-.Xr rtprio 1)
+.Xr rtprio 1 )
 .It Cm ruid
 real user ID
 .It Cm ruser
@@ -925,9 +925,9 @@ Display information on all system processes:
 .Xr kvm 3 ,
 .Xr libxo 3 ,
 .Xr strftime 3 ,
-.Xr xo_options 7 ,
 .Xr mac 4 ,
 .Xr procfs 4 ,
+.Xr xo_options 7 ,
 .Xr pstat 8 ,
 .Xr sysctl 8 ,
 .Xr mutex 9