Explicitly call out ownership of vendor controllers.

docs/vendor.md

@@ -90,11 +90,13 @@ non-deterministic errors.
 ## Support
 
 Vendors are responsible for support of their images.  The maintainer (typically
-the person or organization that provides the associated container images) is
+the person or organization that provides the associated container images) is 
 responsible for the support of the vendor image specific node implementation in
-[kne/topo/node](https://github.com/openconfig/kne/tree/main/topo/node)
-as well as the vendor specific examples in
-[kne/examples](https://github.com/openconfig/kne/tree/main/examples).  The
-maintainer should be responsive to community contributions.  In the event the
-maintainer of a particular node implementation is unresponsive a new maintainer
-may take over that implementation.
+[kne/topo/node](https://github.com/openconfig/kne/tree/main/topo/node), the
+vendor specific examples in
+[kne/examples](https://github.com/openconfig/kne/tree/main/examples), as well as
+other vendor software reqiured by the node implementation (e.g., controller or
+operator).  The maintainer should be responsive to community contributions.  In
+the event the maintainer of a particular node implementation is unresponsive a
+new maintainer may take over that implementation.
+