Added SuspiciousOperation to list of caught exceptions in testing docs.
Corrected --noinput docs for makemigrations; refs #23407.
Fixed #23473 -- Documented that @deconstructible classes need __eq__.
Fixed #22959 -- Documented that class-based validators need to be deconstructible.
Fixed #23421 -- Corrected TEST SERIALIZE setting.

Thanks gkoller for the report.
Revert "Fixed #23474 -- Prevented migrating backwards from unapplying the wrong migrations."

This reverts commit abcf28a07695a45cb5fb15b81bffc97bea5e0be3.
Fixed #23538 -- Added SchemaEditor for MySQL GIS.
Test suggestions.