Clarify that join_authorised_via_users_server auth event is only necessary for joins
#2100
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Since the field is only checked in the authorization rules when the
membershipisjoin: 4.3.5 in room v11.This matches the behavior of Synapse: https://github.com/element-hq/synapse/blob/51df675c054369576ed9bde8d1865c904fa6056c/synapse/event_auth.py#L1176
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