Use bash comments in kubectl examples

Comments in kubectl examples should use bash comments, not Go comments.
So, replaces // by # for example strings.

pkg/kubectl/cmd/create.go

@@ -34,10 +34,10 @@ const (
 	create_long = `Create a resource by filename or stdin.
 
 JSON and YAML formats are accepted.`
-	create_example = `// Create a pod using the data in pod.json.
+	create_example = `# Create a pod using the data in pod.json.
 $ kubectl create -f ./pod.json
 
-// Create a pod based on the JSON passed into stdin.
+# Create a pod based on the JSON passed into stdin.
 $ cat pod.json | kubectl create -f -`
 )