Feedback: Migrate from MySQL - show MOLT Fetch too

Page: https://cockroachlabs.com/docs/v24.3/migrate-from-mysql.html

## What is the reason for your feedback?

[x] Missing the information I need

[ ] Too complicated

[ ] Out of date

[ ] Something is broken

[ ] Other

## Additional details

This page shows how to migrate the data from MySQL using CSV files and IMPORT. That is fine, but this page really should also show how to migrate the data using MOLT Fetch. That will make this page more practical and relevant for many real-world migrations for which the customer business requirements do not allow the increased downtime required when using IMPORT.

Jira issue: DOC-12252