Add must-gather xref for troubleshooting ovn-k8s

- https://issues.redhat.com/browse/OCPBUGS-25366

Author: jab-rh

networking/ovn_kubernetes_network_provider/ovn-kubernetes-troubleshooting-sources.adoc

@@ -6,8 +6,7 @@ include::_attributes/common-attributes.adoc[]
 
 toc::[]
 
-OVN-Kubernetes has many sources of built-in health checks and logs.
-
+OVN-Kubernetes has many sources of built-in health checks and logs. Follow the instructions in these sections to examine your cluster. If a support case is necessary, follow the xref:../../support/gathering-cluster-data.adoc#support_gathering_data_gathering-cluster-data[support guide] to collect additional information through a `must-gather`. Only use the `-- gather_network_logs` when instructed by support.
 
 include::modules/nw-ovn-kubernetes-readiness-probes.adoc[leveloffset=+1]
 
@@ -32,7 +31,6 @@ include::modules/nw-ovn-kubernetes-pod-connectivity-checks.adoc[leveloffset=+1]
 [id="additional-resources_ovn-kubernetes-sources-of-troubleshooting-information"]
 == Additional resources
 
+* xref:../../support/gathering-cluster-data.adoc#support_gathering_data_gathering-cluster-data[Gathering data about your cluster for Red Hat Support]
 * xref:../../networking/verifying-connectivity-endpoint.adoc#nw-pod-network-connectivity-implementation_verifying-connectivity-endpoint[Implementation of connection health checks]
 * xref:../../networking/verifying-connectivity-endpoint.adoc#nw-pod-network-connectivity-verify_verifying-connectivity-endpoint[Verifying network connectivity for an endpoint]
-
-