OSDOCS-9107: remove broken xref 4.15 MicroShift

Author: ShaunaDiaz

microshift_networking/microshift-networking-settings.adoc

@@ -38,8 +38,3 @@ include::modules/microshift-deploying-a-load-balancer.adoc[leveloffset=+1]
 include::modules/microshift-blocking-nodeport-access.adoc[leveloffset=+1]
 
 include::modules/microshift-mDNS.adoc[leveloffset=+1]
-
-[id="additional-resources_microshift-understanding-networking-settings_{context}"]
-[role="_additional-resources"]
-== Additional resources
-* xref:../microshift_release_notes/microshift-4-15-release-notes.adoc#microshift-4-15-known-issues[{microshift-short} {product-version} release notes --> Known issues]