OBSDOCS-2136 back-fill advisory for COO 1.2.1

Author: gabriel-rh

observability/cluster_observability_operator/cluster-observability-operator-release-notes.adoc

@@ -50,6 +50,10 @@ If you have previously resolved the issue in 1.2.1 and then upgrade to 1.2.2, th
 [id="cluster-observability-operator-release-notes-1-2-1_{context}"]
 == {coo-full} 1.2.1
 
+The following advisory is available for {coo-full} 1.2.1:
+
+* link:https://access.redhat.com/errata/RHBA-2025:10696[RHBA-2025:10696 {coo-full} 1.2.1]
+
 [id="cluster-observability-operator-1-2-1-bug-fixes_{context}"]
 === Bug fixes