fix mandoc warnings

- sort references in SEE ALSO section to section number, name.
- cols.1: proper order of sections.
- wrap lines to max 79 column length.

kill.1

@@ -22,19 +22,18 @@ by default sends a TERM signal to the given processes.
 .Sh OPTIONS
 .Bl -tag -width Ds
 .It Fl s Ar signal_name
-A symbolic signal name specifying the signal to be sent instead
-of the default SIGTERM.
-Sends the named signal.
+A symbolic signal name specifying the signal to be sent instead of the
+default SIGTERM. Sends the named signal.
 .It Fl l Op Ar exit_status
-Lists available signals.  If an
+Lists available signals. If an
 .Ar exit_status
 is given, only the corresponding signal name will be printed.
 .It Fl signal_name
 A symbolic signal name specifying the signal to be sent instead
 of the default SIGTERM.
 .It Fl signal_number
-A non-negative decimal integer specifying the signal to be sent
-instead of the default SIGTERM.
+A non-negative decimal integer specifying the signal to be sent instead of
+the default SIGTERM.
 .El
 .Sh SEE ALSO
 .Xr kill 2 ,