This PR is simply porting https://github.com/matrix-org/synapse/pull/9372 to dinsic. I also had to bring in https://github.com/matrix-org/synapse/pull/8821 and https://github.com/matrix-org/synapse/pull/9084 for this code to work properly - a sign that we should merge mainline into dinsic again soon.
Synapse Documentation
This directory contains documentation specific to the synapse homeserver.
All matrix-generic documentation now lives in its own project, located at matrix-org/matrix-doc
(Note: some items here may be moved to matrix-org/matrix-doc at some point in the future.)