Doc: Remove mysql and aws groups from self-install instructions
What does this MR do and why?
This MR removes a few gem groups from the installation instructions for self-installed instances, that I believe to be remnants from times gone by.
There are no aws and mysql groups in the Gemfile and mysql has not been supported by GitLab for many releases, while the aws-sdk gem is included by default, so it seems safe to remove these remnants.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.