docs: fix manual page warnings

All warnings where about unnecessary quoting.  The scriptlet
below will tell what was wrong.

for I in ./top/top.1 ./ps/ps.1 ./*.[0-9]; do
    echo "== $I warnings =="
    man --warnings=all $I > /dev/null
done

This should probably be turned to 'make check' script.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

watch.1

@@ -185,25 +185,25 @@ The watch will propagate command exit status as child exit status.
 The original
 .B watch
 was written by
-.UR rembo\@\:unisoft.\:com
+.UR rembo@\:unisoft.\:com
 Tony Rems
 .UE
 in 1991, with mods and
 corrections by Francois Pinard.  It was reworked and new features added by
-.UR mkc\@\:acm.\:org
+.UR mkc@\:acm.\:org
 Mike Coleman
 .UE
 in 1999. The beep, exec, and error handling features were added by
-.UR morty\@\:frakir.\:org
+.UR morty@\:frakir.\:org
 Morty Abzug
 .UE
 in 2008.  On a not so dark and stormy morning in March of 2003,
-.UR asd\@\:suespammers.\:org
+.UR asd@\:suespammers.\:org
 Anthony DeRobertis
 .UE
 got sick of his watches that should update every minute eventually updating
 many seconds after the minute started, and added microsecond precision.
 Unicode support was added in 2009 by
-.UR procps\@\:rrod.\:net
+.UR procps@\:rrod.\:net
 Jarrod Lowe
 .UE