Switch self-healing feature to ReplicaSet

Don't highlight the legacy ReplicationController API when talking about
Kubernetes' ability to self-heal.

Author: Tim Bannister

content/en/docs/concepts/workloads/controllers/replicaset.md

@@ -4,6 +4,13 @@ reviewers:
 - bprashanth
 - madhusudancs
 title: ReplicaSet
+feature:
+  title: Self-healing
+  anchor: How a ReplicaSet works
+  description: >
+    Restarts containers that fail, replaces and reschedules containers when nodes die,
+    kills containers that don't respond to your user-defined health check,
+    and doesn't advertise them to clients until they are ready to serve.
 content_type: concept
 weight: 20
 ---

content/en/docs/concepts/workloads/controllers/replicationcontroller.md

@@ -3,12 +3,6 @@ reviewers:
 - bprashanth
 - janetkuo
 title: ReplicationController
-feature:
-  title: Self-healing
-  anchor: How a ReplicationController Works
-  description: >
-    Restarts containers that fail, replaces and reschedules containers when nodes die, kills containers that don't respond to your user-defined health check, and doesn't advertise them to clients until they are ready to serve.
-
 content_type: concept
 weight: 90
 ---