Downloadable examples for “Run applications” section (#14147)

* Move examples ahead of commands that use them

In support of https://github.com/kubernetes/website/issues/12740

The aim is to adopt a consistent style around providing downloadable
examples for use with kubectl, etc.

* Tweak wording for stateful app pod example

* Adopt formatting conventions for code blocks

* Move ReplicationController sample YAML to examples

In aid of https://github.com/kubernetes/website/issues/12740

* Move PodDisruptionBudget sample YAML to examples

In aid of https://github.com/kubernetes/website/issues/12740

* Update test schema for new examples

* Use Unicode ellipsis in example

Aim here is to make the elision more obvious

content/en/examples/policy/zookeeper-pod-disruption-budget-maxunavailable.yaml

@@ -0,0 +1,9 @@
+apiVersion: policy/v1beta1
+kind: PodDisruptionBudget
+metadata:
+  name: zk-pdb
+spec:
+  maxUnavailable: 1
+  selector:
+    matchLabels:
+      app: zookeeper

content/en/examples/policy/zookeeper-pod-disruption-budget-minavailable.yaml

@@ -0,0 +1,9 @@
+apiVersion: policy/v1beta1
+kind: PodDisruptionBudget
+metadata:
+  name: zk-pdb
+spec:
+  minAvailable: 2
+  selector:
+    matchLabels:
+      app: zookeeper