Add link to runner security
What does this MR do?
Links to documentation on security of running jobs from the higher level docs.gitlab.com/security page. Inspired by https://gitlab.com/gitlab-org/gitlab-ee/issues/4074#note_47601018
Are there points in the code the reviewer needs to double check?
Is the link correct? Can't preview locally.
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered -
If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan