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>

ps/ps.1

@@ -1855,32 +1855,32 @@ ISO/IEC 9945:2003
 .SH AUTHOR
 .B ps
 was originally written by
-.UR lankeste\@\:fwi.\:uva.\:nl
+.UR lankeste@\:fwi.\:uva.\:nl
 Branko Lankester
 .UE .
-.UR johnsonm\@\:redhat.\:com
+.UR johnsonm@\:redhat.\:com
 Michael K. Johnson
 .UE
 re\-wrote it significantly to use the proc filesystem, changing a few things
 in the process.
-.UR mjshield\@\:nyx.\:cs.\:du.\:edu
+.UR mjshield@\:nyx.\:cs.\:du.\:edu
 Michael Shields
 .UE
 added the pid\-list feature.
-.UR cblake\@\:bbn.\:com
+.UR cblake@\:bbn.\:com
 Charles Blake
 .UE
 added multi\-level sorting, the dirent\-style library, the device
 name\-to\-number mmaped database, the approximate binary search directly on
 System.map, and many code and documentation cleanups.  David Mossberger\-Tang
 wrote the generic BFD support for psupdate.
-.UR albert\@\:users.\:sf.\:net
+.UR albert@\:users.\:sf.\:net
 Albert Cahalan
 .UE
 rewrote ps for full Unix98 and BSD support, along with some ugly hacks for
 obsolete and foreign syntax.
 .PP
 Please send bug reports to
-.UR procps\@\:freelists.\:org
+.UR procps@\:freelists.\:org
 .UE .
 No subscription is required or suggested.