Code review comment for lp:~spiv/bzr/alias-loc-docs-337834

Thanks Ian, actually I do that in the 2.1 version of this branch. But that feature isn't in 2.0 :(

I think so long as that feature is documented in an appropriate docstring in bzrlib/help_topics/__init__.py somewhere, it's probably visible enough for now. But perhaps the developer (and/or plugin author) guide should have a short section on writing help topics, if it doesn't already?