docs: PCP-4752: MAAS Node Pool AZ Breaking Change (#7659)

* Adding MAAS node pool AZ breaking change

* ci: auto-formatting prettier issues

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Co-authored-by: achuribooks <[email protected]>

Author: achuribooks

docs/docs-content/release-notes/release-notes.md

@@ -21,6 +21,12 @@ tags: ["release-notes"]
 
 #### Breaking Changes {#breaking-changes-4.7.a}
 
+- Availability zones are now required for MAAS [node pools](../clusters/cluster-management/node-pool.md) when deploying
+  [MAAS clusters](../clusters/data-center/maas/create-manage-maas-clusters.md). Availability zones are _not_ required
+  when performing Day-2 node pool updates on MAAS clusters deployed prior to Palette version 4.7.a. Changing
+  availability zones post-cluster deployment will trigger a
+  [node pool repave](../clusters/cluster-management/node-pool.md#repave-behavior-and-configuration).
+
 #### Features
 
 #### Improvements