Updated changeset with breaking changes documentation

.changeset/fast-flowers-tickle.md

@@ -4,3 +4,28 @@
 ---
 
 Added support for multiple Kafka clusters and multiple consumers per component.
+Note that this introduces several breaking changes.
+
+1. Configuration in `app-config.yaml` has changed to support the ability to configure multiple clusters. This means you are required to update the configs in the following way:
+
+```diff
+kafka:
+   clientId: backstage
+-  brokers:
+-    - localhost:9092
++  clusters:
++    - name: prod
++      brokers:
++        - localhost:9092
+```
+
+2. Configuration of services has changed as well to support multiple clusters:
+
+```diff
+  annotations:
+-    kafka.apache.org/consumer-groups: consumer
++    kafka.apache.org/consumer-groups: prod/consumer
+```
+
+3. Kafka Backend API has changed, so querying offsets of a consumer group is now done with the following query path:
+   `/consumers/${clusterId}/${consumerGroup}/offsets`