help: properly document the default pattern
The default isn't to glob. It's relpath, which does no globbing at
all. Thus most commands and options like -X/-I and hg files require
`glob:` in front of them to actually do any globbing.
I think long ago the default was to glob, but that hasn't been true
for a long time.
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).