doc: fix explanation comment in acl extension
according to configuration in "acl.deny" below, group "@hg-denied"
also be denied for all files, so add such description to comment for
configuration.
[acl.deny]
# user6 will not have write access to any file:
** = user6
# Group "hg-denied" will not have write access to any file:
** = @hg-denied
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