Move Garbage Collection topic. (#2874)

* Move Garbage Collection topic.

* Fix included file.

docs/concepts/workloads/controllers/garbage-collection.md

@@ -1,5 +1,8 @@
 ---
 title: Garbage Collection
+redirect_from:
+- "/docs/concepts/abstractions/controllers/garbage-collection/"
+- "/docs/concepts/abstractions/controllers/garbage-collection.html"
 ---
 
 {% capture overview %}
@@ -30,7 +33,7 @@ relationships between owners and dependents by manually setting the
 
 Here's a configuration file for a ReplicaSet that has three Pods:
 
-{% include code.html language="yaml" file="my-repset.yaml" ghlink="/docs/concepts/abstractions/controllers/my-repset.yaml" %}
+{% include code.html language="yaml" file="my-repset.yaml" ghlink="/docs/concepts/workloads/controllers/my-repset.yaml" %}
 
 If you create the ReplicaSet and then view the Pod metadata, you can see
 OwnerReferences field:

docs/concepts/workloads/controllers/my-repset.yaml

@@ -0,0 +1,17 @@
+apiVersion: extensions/v1beta1
+kind: ReplicaSet
+metadata:
+  name: my-repset
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      pod-is-for: garbage-collection-example
+  template:
+    metadata:
+      labels:
+        pod-is-for: garbage-collection-example
+    spec:
+      containers:
+      - name: nginx
+        image: nginx