add extra note about the rationale of this change

Signed-off-by: ChrsMark <[email protected]>

.chloggen/add_deploy_replica_metrics.yaml

@@ -14,9 +14,12 @@ note: Add metrics for k8s deployment, replicaset, replication_controller, statef
 
 # Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
 # The values here must be integers.
-issues: [1636]
+issues: [1636, 1637, 1644]
 
 # (Optional) One or more lines of additional information to render under the primary note.
 # These lines will be padded with 2 spaces and then inserted directly into the document.
 # Use pipe (|) for multiline entries.
-subtext:
+subtext: |
+  This addition focused on providing consistency between these metrics, while
+  also ensuring alignment with recommendations from Kubernetes.
+  More details in https://github.com/open-telemetry/semantic-conventions/issues/1637