Fix lintian error in manpages.
Fix lintian error in manpages.

Fixes a lintian I: message about improper use of minus instead
of a hyphen.

The Debian/Ubuntu maintainers have been keeping this as a diff,
and couldn't be bothered to contribute it upstream.


git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@17808 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django