docs: Tidying of ps,kill and skill manpages

Some minor tidying of these three man pages using more of the modern
(ish) macros that have been around for a while.

References:
 https://bugs.debian.org/893452
 https://bugs.debian.org/893457
 https://bugs.debian.org/894480

Signed-off-by: Craig Small <csmall@enc.com.au>

kill.1

@@ -1,11 +1,12 @@
-'\" t
-.\" (The preceding line is a note to broken versions of man to tell
-.\" them to pre-process this man page with tbl)
-.\" Man page for kill.
-.\" Licensed under version 2 of the GNU General Public License.
-.\" Written by Albert Cahalan; converted to a man page by
-.\" Michael K. Johnson
-.TH KILL 1 "October 2011" "procps-ng" "User Commands"
+.ig
+Written by Albert Cahalan, converted to a man page by Michael K. Johnson
+
+This manpage is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+..
+.TH KILL 1 "2018-05-31" "procps-ng" "User Commands"
 .SH NAME
 kill \- send a signal to a process
 .SH SYNOPSIS
@@ -64,7 +65,7 @@ Kill all processes you can kill.
 .B kill \-l 11
 Translate number 11 into a signal name.
 .TP
-.B kill -L
+.B kill \-L
 List the available signal choices in a nice table.
 .TP
 .B kill 123 543 2341 3453
@@ -78,16 +79,16 @@ Send the default signal, SIGTERM, to all those processes.
 .BR signal (7),
 .BR skill (1)
 .SH STANDARDS
-This command meets appropriate standards. The
+This command meets appropriate standards.  The
 .B \-L
 flag is Linux-specific.
 .SH AUTHOR
-.UR albert@users.sf.net
+.MT albert@users.sf.net
 Albert Cahalan
-.UE
+.ME
 wrote kill in 1999 to replace a bsdutils one that was not standards
 compliant.  The util-linux one might also work correctly.
 .SH "REPORTING BUGS"
 Please send bug reports to
-.UR procps@freelists.org
-.UE
+.MT procps@freelists.org
+.ME