Update changelog.

Author: clokep

CHANGES.md

@@ -11,7 +11,7 @@ Bugfixes
 --------
 
 - Fix new ratelimiting for invites to respect the `ratelimit` flag on application services. Introduced in v1.27.0rc1. ([\#9302](https://github.com/matrix-org/synapse/issues/9302))
-- Do not automatically calculate `public_baseurl` since it can be wrong in some situations. ([\#9313](https://github.com/matrix-org/synapse/issues/9313))
+- Do not automatically calculate `public_baseurl` since it can be wrong in some situations. Reverts behaviour introduced in v1.26.0. ([\#9313](https://github.com/matrix-org/synapse/issues/9313))
 
 
 Improved Documentation
@@ -23,7 +23,7 @@ Improved Documentation
 Synapse 1.27.0rc1 (2021-02-02)
 ==============================
 
-Note that this release includes a change in Synapse to use Redis as a cache ─ as well as a pub/sub mechanism ─ if Redis support is enabled. No action is needed by server administrators, and we do not expect resource usage of the Redis instance to change dramatically.
+Note that this release includes a change in Synapse to use Redis as a cache ─ as well as a pub/sub mechanism ─ if Redis support is enabled for workers. No action is needed by server administrators, and we do not expect resource usage of the Redis instance to change dramatically.
 
 This release also changes the callback URI for OpenID Connect (OIDC) identity providers. If your server is configured to use single sign-on via an OIDC/OAuth2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.