[bug-diffutils] man diff Exit status deserves own section

[jidanni]

In man diff

       FILES  are  `FILE1  FILE2'  or `DIR1 DIR2' or `DIR FILE...' or `FILE...
       DIR'.  If --from-file or --to-file is given, there are no  restrictions
       on  FILE(s).   If a FILE is `-', read standard input.  Exit status is 0
       if inputs are the same, 1 if different, 2 if trouble.

Exit status deserves its own section, just like man cat... which,
wait... doesn't even mention exit status. OK... at least all man pages
should mention it or all just say it in Info.