[Merged by Bors] - Document database migrations #3203
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Proposed Changes
Add documentation for the
lighthouse db migate
command, which users will be able to use to downgrade from Lighthouse v2.3.0 on non-merge networks (mainnet & Prater).I think it's important to get this into the live instance of the book so we can link to it from the v2.3.0 release notes.