[DOCS] Adds security update to 7.11.2 release notes (#95175)

* [DOCS] Adds security update to 7.11.2 release notes

* [DOCS] Adds security content

docs/CHANGELOG.asciidoc

@@ -95,11 +95,29 @@ For detailed information about the n.n.n release, review the following sections.
 [[release-notes-7.11.2]]
 == {kib} 7.11.2
 
-The 7.11.2 release includes the following bug fixes. For information on the breaking changes, refer to <<breaking-changes-7.11,Breaking changes in 7.11>>.
+The 7.11.2 release includes the following security update, known issue, and bug fixes. For information on the breaking changes, refer to <<breaking-changes-7.11,Breaking changes in 7.11>>.
+
+[float]
+[[security-update-v7.11.2]]
+=== Security update
+
+When you use the following background API calls, {kib} extends your session and fails to log you out:
+
+* POST /api/ui_metric/report
+
+* POST /api/index_management/indices/reload
+
+* POST /api/index_lifecycle_management/policies?withIndices=true
+
+* GET /api/remote_clusters
+
+* GET /api/saved_objects_tagging/tags
+
+To avoid extending the session, use the `kbn-system-request` header, which indicates that the API call is not a user request.
 
 [float]
 [[known-issues-v7.11.2]]
-=== Known issues
+=== Known issue
 
 When upgrading from 7.11.0 or 7.11.1 to 7.11.2, certain connectors, including those that connect to Jira,
 ServiceNow, and IBM Resilient, are not properly migrated during the upgrade process, causing them to be