OCP BUGS-2365: Adding support info for oc-mirror

Author: bergerhoffer

installing/disconnected_install/installing-mirroring-disconnected.adoc

@@ -22,6 +22,9 @@ The following steps outline the high-level workflow on how to use the oc-mirror
 // About the oc-mirror plug-in
 include::modules/oc-mirror-about.adoc[leveloffset=+1]
 
+// oc-mirror compatibility and support
+include::modules/oc-mirror-support.adoc[leveloffset=+1]
+
 // About the mirror registry
 include::modules/installation-about-mirror-registry.adoc[leveloffset=+1]
 

modules/oc-mirror-support.adoc

@@ -0,0 +1,17 @@
+// Module included in the following assemblies:
+//
+// * installing/disconnected_install/installing-mirroring-disconnected.adoc
+
+:_content-type: CONCEPT
+[id="oc-mirror-support_{context}"]
+= oc-mirror compatibility and support
+
+The oc-mirror plug-in supports mirroring {product-title} payload images and Operator catalogs for {product-title} versions 4.9 and later.
+
+Use the latest available version of the oc-mirror plug-in regardless of which versions of {product-title} you need to mirror.
+
+// TODO: remove this note for 4.12
+[IMPORTANT]
+====
+If you used the Technology Preview version of the oc-mirror plug-in for {product-title} 4.10, it is not possible to migrate your mirror registry to {product-title} 4.11. You must download the new oc-mirror plug-in, use a new storage back end, and use a new top-level namespace on the target mirror registry.
+====