Update CHANGES.md

Author: Sean Quah

Diff for: CHANGES.md

@@ -1,11 +1,16 @@
 Synapse 1.71.0rc2 (2022-11-04)
 ==============================
 
+Please note that, as announced in the release notes for Synapse 1.69.0, legacy Prometheus metric names are now disabled by default.
+They will be removed altogether in Synapse 1.73.0.
+If not already done, server administrators should update their dashboards and alerting rules to avoid using the deprecated metric names.
+See the [upgrade notes](https://matrix-org.github.io/synapse/v1.71/upgrade.html#upgrading-to-v1710) for more details.
+
+
 Improved Documentation
 ----------------------
 
-- Replace references to legacy metrics `synapse_admin_mau` with new metric names. ([\#14358](https://github.com/matrix-org/synapse/issues/14358))
-- Include monthly active user metrics in the list of legacy metrics names. ([\#14360](https://github.com/matrix-org/synapse/issues/14360))
+- Document the changes to monthly active user metrics due to deprecation of legacy Prometheus metric names. ([\#14358](https://github.com/matrix-org/synapse/issues/14358), [\#14360](https://github.com/matrix-org/synapse/issues/14360))
 
 
 Deprecations and Removals
@@ -20,15 +25,6 @@ Internal Changes
 - Run unit tests against Python 3.11. ([\#13812](https://github.com/matrix-org/synapse/issues/13812))
 
 
-Synapse (Next) (2022-11-01)
-=========================
-
-Please note that, as announced in the release notes for Synapse 1.69.0, legacy Prometheus metric names are now disabled by default.
-They will be removed altogether in Synapse 1.73.0.
-If not already done, server administrators should update their dashboards and alerting rules to avoid using the deprecated metric names.
-See the [upgrade notes](https://matrix-org.github.io/synapse/v1.71/upgrade.html#upgrading-to-v1710) for more details.
-
-
 Synapse 1.71.0rc1 (2022-11-01)
 ==============================