doc: fix careless document miss in help of hgext/notify
according to configuration example below, and direction of changeset
transference, this paragraph should describe about "changegroup" hook.
[hooks]
# one email for each incoming changeset
incoming.notify = python:hgext.notify.hook
# one email for all incoming changesets
changegroup.notify = python:hgext.notify.hook
# one email for all outgoing changesets
outgoing.notify = python:hgext.notify.hook
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