[PATCH] help: properly document the default pattern

[Jordi Gutiérrez Hermoso]

# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh at octave.org>
# Date 1550269232 18000
#      Fri Feb 15 17:20:32 2019 -0500
# Node ID e5b62cbab03e443841b23a333aac035ad3987fbf
# Parent  d3ec8201610485fa8bfda40771869ae67bfc6404
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.

diff --git a/mercurial/helptext/patterns.txt b/mercurial/helptext/patterns.txt
--- a/mercurial/helptext/patterns.txt
+++ b/mercurial/helptext/patterns.txt
@@ -1,8 +1,10 @@
 Mercurial accepts several notations for identifying one or more files
 at a time.
 
-By default, Mercurial treats filenames as shell-style extended glob
-patterns.
+By default, Mercurial treats filenames verbatim without pattern
+matching, relative to the current working directory. Note that your
+system shell might perform pattern matching of its own before passing
+filenames into Mercurial.
 
 Alternate pattern notations must be specified explicitly.