Description
Jenkins and plugins versions report
Environment
Paste the output here
What Operating System are you using (both controller, and any agents involved in the problem)?
I'm using mac, but it's not important.
Reproduction steps
Step 1. Navigate to {JENKINS_URL}/jenkins/job/{pipeline_job_name}/pipeline-syntax/globals and see the list of available global vars, but pullRequest var is missing.
Expected Results
When user navigate to {JENKINS_URL}/jenkins/job/{pipeline_job_name}/pipeline-syntax/globals pullRequest global variable should be listed.
Actual Results
When user navigate to {JENKINS_URL}/jenkins/job/{pipeline_job_name}/pipeline-syntax/globals pullRequest global variable is not listed.
Anything else?
I guess https://github.com/jenkinsci/pipeline-github-plugin/blob/master/src/main/java/org/jenkinsci/plugins/pipeline/github/PullRequestGlobalVariable.java#L15 should be an @Extension and description of all vars should be provided.
I think this improvement will significantly increase the use and recognition of the plugin.