praefect docs: Indicate Praefect needs to connect back to GitLab
What does this MR do and why?
praefect docs: Indicate Praefect needs to connect back to GitLab
Praefect is gaining the ability to check with Rails regarding feature flags. This means architecturally Praefect needs to be able to connect to Rails. This change calls that out in the documentation.
fixes: #365086 (comment 987569502)
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