Document the `coordinator` and make the FAQ list unordered (!567) · Merge requests · GitLab.org / gitlab-runner · GitLab

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username-removed-128633 requested to merge improve-faq into master Apr 28, 2017

This documents coordinator since some people wonder what this is (https://gitlab.com/gitlab-org/gitlab-ci-multi-runner/issues/2287#note_26604329).
This makes the FAQ list unordered since that doesn't really make sense, and that complicates future update of the FAQ.

/cc @markglenfletcher