DM: Add more notes for MariaDB

[dveeden]

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[gemini-code-assist]

Summary of Changes

Hello @dveeden, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the TiDB Data Migration (DM) documentation by adding a crucial compatibility requirement for MariaDB 11.4 and later versions. It ensures that users are aware of the need to configure the binlog_legacy_event_pos variable to OFF when replicating data, thereby preventing potential issues and improving the clarity of migration guidelines. A related document was also updated to accurately reference these new settings.

Highlights

• MariaDB Compatibility: Added a critical note to the DM compatibility catalog, specifying that for MariaDB 11.4 and later, the binlog_legacy_event_pos variable must be set to OFF to ensure proper Data Migration (DM) functionality.
• Documentation Enhancement: Updated the migrate-from-mariadb.md document to reflect that the DM Compatibility Catalog now includes 'required settings' in addition to supported versions, aligning with the newly added compatibility note.

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[gemini-code-assist]

Code Review

This pull request adds a note about the binlog_legacy_event_pos setting required for MariaDB 11.4 and later when using DM, and updates a related document to mention that required settings are listed in the compatibility catalog. My review focuses on improving clarity and conciseness according to the documentation style guide. I've suggested a minor punctuation fix for better readability and a wording adjustment to remove redundancy. The changes are otherwise good and improve the documentation's accuracy.

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[lance6716]

Add the related code PR in this PR's description? We can know which versions should be cherry-picked (Sorry I'm busy and still have no time to review that PR)