Description of problem:
Using the ‘stage’ step without a block argument is deprecated, if we still define stage without a block argument it will introduce unexpected result as bug 1410680, so it's better to update Jenkinsfile Examples with new definition

Version-Release number of selected component (if applicable):
v3.5.0.6+87f6173
Jenkins Image:openshift3/jenkins-2-rhel7@sha256:53fc8af74d667b54f52e76976a93f17666ed03d5564e88a509072bd971ae6399

How reproducible:
Always

Steps to Reproduce:
1.Create Jenkins template and Pipeline BC, start Pipeline BC
$ oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/jenkins/jenkins-ephemeral-template.json
$ oc new-app -f https://raw.githubusercontent.com/openshift/origin/master/examples/jenkins/pipeline/samplepipeline.yaml
$ oc start-build sample-pipeline
2.Go to Pipelines -> sample-pipeline -> Configuration tab
3.Click on What's a Jenkinsfile?

Actual results:
3. Will show some Jenkinsfile Examples in popup, take one as example:
node {
  stage 'Build'
  openshiftBuild(buildConfig: 'my-build-config', showBuildLogs: 'true')
  stage 'Deploy'
  openshiftDeploy(deploymentConfig: 'my-deployment-config')
}


Expected results:
3.As bug 1410680 issued, stage definition in Jenkinsfile has changed, using the ‘stage’ step without a block argument is deprecated, it's better to update Jenkinsfile Examples as latest definition.
Especially for users who don't know how to define stage, we need to give correct instructions

Additional info: