Improve signals documentation and add a best practice for graceful shutdown
What does this MR do?
Improves on the documentation for sending signals to the gitlab-runner process. It follows on the discussion in !1909 (comment 313979350)
It adds a note on the signals example and a best practice for graceful shutdown.
Moving docs to a new location?
No
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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