histedit: minor refactoring of createmarkers check
We use a variable to store whether or not we can create obsolescence markers.
It makes the patch series more readable as we are going to reuse this
values in other places in the function.
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.