Update taskRef format

Tekton/Openshift Pipelines are supporting multiple resolvers now, which
changed format of taskRef definition. Old way is still possible but
having performace issues.

Author: Michkov

docs/modules/ROOT/pages/how-to-guides/configuring-builds/proc_customize_build_pipeline.adoc

@@ -48,8 +48,14 @@ name: example-task
       runAfter:
       - build-container #You can be more specific by choosing another task
       taskRef:
-        bundle: <path to container image> 
-        name: example-task
+        params:
+        - name: name
+          value: example-task
+        - name: bundle
+          value: <path to container image>
+        - name: kind
+          value: task
+        resolver: bundles
       when:
       - input: $(params.skip-checks)    #This references the pipeline parameters
         operator: in