Add link to runbook for handling auto deploy branch behind master
What does this MR do and why?
Describe in detail what your merge request does and why.
When an auto deploy branch is very behind master, add a link to the Slack message that is posted.
| Without warnings | With warnings |
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gitlab-com/gl-infra/delivery#2350 (closed)
Author Check-list
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Has documentation been updated?
Edited by Reuben Pereira