DM: Update MariaDB config hints

[dveeden]

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[gemini-code-assist]

Code Review

This pull request updates the MariaDB migration documentation by adding a mandatory binlog configuration section to the precheck guide and refining the preparation steps. Feedback was provided to improve the clarity and consistency of the preparation instructions by using active voice and standardizing terminology.

[dveeden]

/cc @OliverS929

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Timeline:

• 2026-04-21 13:58:16.812354277 +0000 UTC m=+2087902.017714324: ☑️ agreed by GMHDBJD.