patch: match 'diff --git a/' instead of 'diff --git'
This reduces the likelihood of a traceback when trying to email a
patch that happens to have 'diff --git' at the beginning of a line
in the description, as this patch did:
http://markmail.org/message/wxpgowxd7ucxygwe
Mercurial's documentation is kept in reStructuredText format, which is
a simple plain text format that's easy to read and edit:
http://docutils.sourceforge.net/rst.html
It's also convertible to a variety of other formats including standard
UNIX man page format and HTML. You'll need to install Docutils:
http://docutils.sourceforge.net/
Use the Makefile in this directory to generate the man and HTML pages.