Closed requested to merge drop-kubernetes-experimental-notice into master
What does this MR do?
This executor is **EXPERIMENTAL** notice from Kubernetes executor documentation
Moving docs to a new location?
See the guidelines: http://docs.gitlab.com/ce/development/doc_styleguide.html#changing-document-location
Make sure the old link is not removed and has its contents replaced with a link to the new location.
Make sure internal links pointing to the document in question are not broken.
Search and replace any links referring to old docs in GitLab Runner's source code