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.
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"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}