topic: update topic() revset docstring, mention hg help
I was curious why we don't support glob patterns, only re. But turns out it's like this in upstream (e.g. branch revset) as well, so let's point to the relevant help page.
I was curious why we don't support glob patterns, only re. But turns out it's like this in upstream (e.g. branch revset) as well, so let's point to the relevant help page.