Bug#43107: md5sum manpage example is lame; here's a better one

[Ian Jackson <ian@davenant.greenend.org.uk>]

Zygo Blaxell writes ("Bug#43107: md5sum manpage example is lame; here's a better one"):
> The current example text involves calculating the md5sum of md5sum.1.
> This is impossible (at least until MD5 is really broken).

Thanks.  I have applied your patch to my tree.

Ian.