Merge branch '10244-group-runner-docs' into 'master'

Add docs for group runners

Closes #10244

See merge request gitlab-org/gitlab-ce!18807
91 jobs for 10-8-stable-prepare-rc5 in 28 minutes and 40 seconds (queued for 20 seconds)
Status Job ID Name Coverage
  Build
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package-and-qa
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  Prepare
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compile-assets

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  Test
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  Post Test
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coverage
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  Post Cleanup
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