Linkify MSCs

CHANGES.md

@@ -30,8 +30,8 @@ Improved Documentation
 Internal Changes
 ----------------
-- Rename `shared_rooms` to `mutual_rooms` (MSC2666), as per proposal changes. ([\#12036](https://github.com/matrix-org/synapse/issues/12036))
-- Remove check on `update_user_directory` for shared rooms handler (MSC2666), and update/expand documentation. ([\#12038](https://github.com/matrix-org/synapse/issues/12038))
+- Rename `shared_rooms` to `mutual_rooms` ([MSC2666](https://github.com/matrix-org/matrix-doc/pull/2666)), as per proposal changes. ([\#12036](https://github.com/matrix-org/synapse/issues/12036))
+- Remove check on `update_user_directory` for shared rooms handler ([MSC2666](https://github.com/matrix-org/matrix-doc/pull/2666)), and update/expand documentation. ([\#12038](https://github.com/matrix-org/synapse/issues/12038))
 - Refactor `create_new_client_event` to use a new parameter, `state_event_ids`, which accurately describes the usage with [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) instead of abusing `auth_event_ids`. ([\#12083](https://github.com/matrix-org/synapse/issues/12083), [\#12304](https://github.com/matrix-org/synapse/issues/12304))
 - Refuse to start if registration is enabled without email, captcha, or token-based verification unless the new config flag `enable_registration_without_verification` is set. ([\#12091](https://github.com/matrix-org/synapse/issues/12091))
 - Add tests for database transaction callbacks. ([\#12198](https://github.com/matrix-org/synapse/issues/12198))