OSDOCS-9082: Add restoring cluster state link to troublehsooting docs

Author: obrown1205

_topic_maps/_topic_map.yml

@@ -723,6 +723,8 @@ Topics:
    # File: recovering-update-before-applied
   - Name: Gathering data about your cluster update
     File: gathering-data-cluster-update
+  - Name: Restoring your cluster to a previous state
+    File: restoring-cluster-previous-state
 ---
 Name: Support
 Dir: support

updating/troubleshooting_updates/restoring-cluster-previous-state.adoc

@@ -0,0 +1,9 @@
+:_mod-docs-content-type: ASSEMBLY
+[id="restoring-cluster-previous-state"]
+= Restoring your cluster to a previous state
+include::_attributes/common-attributes.adoc[]
+:context: restoring-cluster-previous-state
+
+toc::[]
+
+For information on restoring your cluster to a previous state, see xref:../../backup_and_restore/control_plane_backup_and_restore/disaster_recovery/scenario-2-restoring-cluster-state.adoc#dr-restoring-cluster-state[Restoring to a previous cluster state].