Notes on SSO logins and media_repository worker (#8701)

If SSO login is used (e.g. SAML) in a multi worker setup, it should be mentioned that currently all SAML logins must run on the same worker, see https://github.com/matrix-org/synapse/issues/7530

Also, if you are using different ports (for example 443 and 8448) in a reverse proxy for client and federation, the path `/_matrix/media` on the client and federation port must point to the listener of the `media_repository` worker, otherwise you'll get a 404 on the federation port for the path `/_matrix/media`, if a remote server is trying to get the media object on federation port, see https://github.com/matrix-org/synapse/issues/8695
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Notes on SSO logins and media_repository worker.

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Note that a HTTP listener with `client` and `federation` resources must be
configured in the `worker_listeners` option in the worker config.
Ensure that all SSO logins go to a single process (usually the main process).
For multiple workers not handling the SSO endpoints properly, see
[#7530](https://github.com/matrix-org/synapse/issues/7530).
#### Load balancing
@ -420,6 +423,8 @@ and you must configure a single instance to run the background tasks, e.g.:
media_instance_running_background_jobs: "media-repository-1"
```
Note that if a reverse proxy is used , then `/_matrix/media/` must be routed for both inbound client and federation requests (if they are handled separately).
### `synapse.app.user_dir`
Handles searches in the user directory. It can handle REST endpoints matching