fix deployment example (#1797)

docs/examples/deployment-rollout/README.md

@@ -17,17 +17,20 @@ kubectl apply -f docs/examples/deployment-rollout/app-source.yaml
 ```shell
 kubectl apply -f docs/examples/deployment-rollout/app-target.yaml
 ```
-
-4. Apply the application deployment with pause
+4. Apply scale appRollout
+```shell
+kubectl apply -f docs/examples/deployment-rollout/app-rollout-scale.yaml
+```
+5. Apply the application deployment with pause
 ```shell
 kubectl apply -f docs/examples/deployment-rollout/app-rollout-pause.yaml
 ```
 Check the status of the ApplicationRollout and see the step by step rolling out.
 This rollout will pause after the second batch.
 
-7. Apply the application deployment that completes the rollout
+6. Apply the application deployment that completes the rollout
 ```shell
 kubectl apply -f docs/examples/deployment-rollout/app-rollout-finish.yaml
 ```
-Check the status of the ApplicationRollout and see the rollout completes, and the 
-ApplicationRollout's "Rolling State" becomes `rolloutSucceed`
+Check the status of the AppRollout and see the rollout completes, and the 
+AppRollout's "Rolling State" becomes `rolloutSucceed`

docs/examples/deployment-rollout/app-rollout-pause.yaml

@@ -5,6 +5,7 @@ metadata:
 spec:
   # application (revision) reference
   targetAppRevisionName: test-rolling-v2
+  sourceAppRevisionName: test-rolling-v1
   # HPA reference (optional)
   componentList:
     - metrics-provider

docs/examples/deployment-rollout/app-rollout-scale.yaml

@@ -0,0 +1,14 @@
+apiVersion: core.oam.dev/v1beta1
+kind: AppRollout
+metadata:
+  name: rolling-test
+spec:
+  # application (revision) reference
+  targetAppRevisionName: test-rolling-v1
+  componentList:
+    - metrics-provider
+  rolloutPlan:
+    rolloutStrategy: "IncreaseFirst"
+    rolloutBatches:
+      - replicas: 4
+    targetSize: 5