Move groups/communities deprecation notice to 1.58.0 heading

CHANGES.md

@@ -1,6 +1,8 @@
 Synapse 1.58.0 (2022-05-03)
 ===========================
 
+As of this release, the groups/communities feature in Synapse is now disabled by default. See [\#11584](https://github.com/matrix-org/synapse/issues/11584) for details. As mentioned in [the upgrade notes](https://github.com/matrix-org/synapse/blob/develop/docs/upgrade.md#upgrading-to-v1580), this feature will be removed in Synapse 1.61.
+
 No significant changes since 1.58.0rc2.
 
 
@@ -25,8 +27,6 @@ Internal Changes
 Synapse 1.58.0rc1 (2022-04-26)
 ==============================
 
-As of this release, the groups/communities feature in Synapse is now disabled by default. See [\#11584](https://github.com/matrix-org/synapse/issues/11584) for details. As mentioned in [the upgrade notes](https://github.com/matrix-org/synapse/blob/develop/docs/upgrade.md#upgrading-to-v1580), this feature will be removed in Synapse 1.61.
-
 Features
 --------