Update manhole documentation for async/await. (#8462)
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Update the directions for using the manhole with coroutines.
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@ -35,9 +35,12 @@ This gives a Python REPL in which `hs` gives access to the
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`synapse.server.HomeServer` object - which in turn gives access to many other
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parts of the process.
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Note that any call which returns a coroutine will need to be wrapped in `ensureDeferred`.
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As a simple example, retrieving an event from the database:
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```
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>>> hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org')
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```pycon
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>>> from twisted.internet import defer
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>>> defer.ensureDeferred(hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org'))
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<Deferred at 0x7ff253fc6998 current result: <FrozenEvent event_id='$1416420717069yeQaw:matrix.org', type='m.room.create', state_key=''>>
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```
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