STYLE: Update CONTRIBUTING.md to test slicer/apidocs webhook
Created by: jcfr
This PR is indented to test that the slicer API docs builder is effectively triggered.
System updates will be applied on June 13th between 7am and 9am, EST (UTC-05:00). This site will have intermittent downtime during that time.
Created by: jcfr
This PR is indented to test that the slicer API docs builder is effectively triggered.