Update docs on soft email confirmation
What does this MR do and why?
- There was an error previously; we do not delete unconfirmed users after 3 days, we just block them from logging in until they've confirmed.
- This error was added via !107302 (merged); I could not find any discussion there as to why this was added.
- This change also documents the GitLab.com setting for email confirmation.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Jessie Young