Fix wording of deprecation notice in changelog

CHANGES.md

@@ -10,11 +10,10 @@ Historically, the [Synapse Admin
 API](https://github.com/matrix-org/synapse/tree/master/docs) has been
 accessible under the `/_matrix/client/api/v1/admin`,
 `/_matrix/client/unstable/admin`, `/_matrix/client/r0/admin` and
-`/_synapse/admin` prefixes. In a future release, we will soon be dropping
-support for accessing Synapse's Admin API using the `/_matrix/client/*`
-prefixes. This is to help make locking down external access to the Admin API
-endpoints easier for homeserver admins.
-
+`/_synapse/admin` prefixes. In a future release, we will be dropping support
+for accessing Synapse's Admin API using the `/_matrix/client/*` prefixes. This
+makes it easier for homeserver admins to lock down external access to the Admin
+API endpoints.
 
 Synapse 1.20.0rc5 (2020-09-18)
 ==============================