diffutils 2.8.1: "-H" missing from "diff --help"

[Keith Thompson]

The "-H" option to the diff command is equivalent to the
"--speed-large-files" option, but both the output of "--help" and the
info documentation document only the "--speed-large-files" option,
not the "-H" option.

% diff --version | head -1
diff (GNU diffutils) 2.8.1
% diff --help | egrep -e '-H|--speed'
  --speed-large-files  Assume large files and many scattered small changes.
% diff --speed-large-files /etc/motd /etc/motd
% diff -H /etc/motd /etc/motd
% 

The diffutils-2.8.7 alpha release has the same problem.

-- 
Keith Thompson (The_Other_Keith) address@hidden  <http://www.ghoti.net/~kst>
San Diego Supercomputer Center           <*>  <http://users.sdsc.edu/~kst>
We must do something.  This is something.  Therefore, we must do this.