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.

local test passed
addgroupcopy test passed
clone test passed
lowlevelcopy test passed
slicing test passed
issnapshot test passed
findsnapshot test passed