Quote host/port placeholders in migration docs (#23017)

[ti-chi-bot]

This is an automated cherry-pick of #23017

Wrap the host and port placeholder values in quotes across multiple migration guides to ensure consistent TOML formatting and avoid parsing issues. Updated: migrate-aurora-to-tidb.md, migrate-from-csv-files-to-tidb.md, migrate-from-parquet-files-to-tidb.md, migrate-from-sql-files-to-tidb.md, migrate-large-mysql-shards-to-tidb.md, and migrate-large-mysql-to-tidb.md. Other fields (eg. status-port) were left unchanged.

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[gemini-code-assist]

Code Review

This pull request wraps placeholder variables (such as ${host}, ${port}, and ${status-port}) in double quotes within the TOML configuration blocks across several migration and backup documentation files. A review comment points out a minor alignment issue with a comment in migrate-large-mysql-to-tidb.md and provides a suggestion to fix it.

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[hfxsd]

/approve

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