hgrc.5: drop 'hgext.' prefix when talking about extensions
The first paragraph apply to all extensions, not just those in hgext.
The second paragraph can just use the simpler form to load mq.
test that 'hg commit' does not crash if the user removes a newly added file
$ hg init
$ echo This is file a1 > a
$ hg add a
$ hg commit -m "commit #0"
$ touch b
$ hg add b
$ rm b
$ hg commit -A -m"comment #1"
removing b
nothing changed
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