Add some markup missed in previous.

bin/ps/ps.1

@@ -1,4 +1,4 @@
-.\"	$NetBSD: ps.1,v 1.73 2006/10/02 17:57:01 apb Exp $
+.\"	$NetBSD: ps.1,v 1.74 2006/10/02 20:54:27 apb Exp $
 .\"
 .\" Copyright (c) 1980, 1990, 1991, 1993, 1994
 .\"	The Regents of the University of California.  All rights reserved.
@@ -145,9 +145,11 @@ The
 .Fl O
 option does not suppress the default display;
 it inserts additional keywords just after the
-pid keyword in the default display,
-or after the pid keyword (if any)
-in a non-default display specified before the first use of the
+.Ar pid
+keyword in the default display, or after the
+.Ar pid
+keyword (if any) in a non-default display specified before the
+first use of the
 .Fl O
 flag.
 Keywords inserted by multiple
@@ -432,9 +434,10 @@ trimmed off and the result is printed in hex, for example, 0x80324000 prints
 as 324000.
 .El
 .Pp
-When printing using the command keyword, a process that has exited and
-has a parent that has not yet waited for the process (in other words, a zombie)
-is listed as
+When printing using the
+.Ar command
+keyword, a process that has exited and has a parent that has not yet
+waited for the process (in other words, a zombie) is listed as
 .Dq Aq defunct ,
 and a process which is blocked while trying to exit is listed as
 .Dq Aq exiting .
@@ -444,8 +447,12 @@ will try to locate the processes' argument vector from the user
 area in order to print the command name and arguments.
 This method is not reliable because a process is allowed to destroy this
 information.
-The ucomm (accounting) keyword will always contain
-the real command name as contained in the process structure's p_comm field.
+The
+.Ar ucomm
+(accounting) keyword will always contain the real command name as
+contained in the process structure's
+.Va p_comm
+field.
 .Pp
 If the command vector cannot be located (usually because it has not
 been set, as is the case of system processes and/or kernel threads)