Fix v1beta1 to v1 migration doc

This commit follows up on #5415 and resolves the respective comments.

Author: JeromeJu

docs/migrating-v1alpha1-to-v1beta1.md

@@ -74,7 +74,7 @@ spec:
 ```
 
 ## Replacing `PipelineResources` with `Tasks`
-You can replace the `PipelineResources` with `Tasks` following the [reference](https://github.com/tektoncd/pipeline/blob/main/docs/pipelineresources.md)
+See ["Replacing PipelineResources with Tasks"](https://github.com/tektoncd/pipeline/blob/main/docs/pipelineresources.md#replacing-pipelineresources-with-tasks) for information and examples on how to replace PipelineResources when migrating from v1alpha1 to v1beta1.
 
 ## Changes to PipelineResources
 

docs/migrating-v1beta1-to-v1.md

@@ -49,7 +49,7 @@ spec:
     name: example-task
     bundle: python:3-alpine
 ---
-apiVersion: tekton.dev/v1beta1
+apiVersion: tekton.dev/v1
 kind: Taskrun
 spec:
   taskRef:
@@ -74,6 +74,15 @@ to `Pipeline`s and `Task`s defined in other namespaces in the cluster.
 ```yaml
 apiVersion: tekton.dev/v1beta1
 kind: TaskRun
+metadata:
+  name: cluster-task-reference
+spec:
+  taskRef:
+    name: example-task
+    kind: ClusterTask
+---
+apiVersion: tekton.dev/v1
+kind: TaskRun
 metadata:
   name: cluster-task-reference
 spec: