Mattl gitshell fixes
See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html
What does this MR do?
Updates the docs to require GitLab Shell 4.0.3
Moving docs to a new 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 Rails app, specifically under the
- If working on CE, submit an MR to EE with the changes as well.