Update managed-io.md for release 2.70.0-RC4

[shunping]

Content generated from release 2.70.0-RC4.

[gemini-code-assist]

Summary of Changes

Hello @shunping, 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 focuses on synchronizing the managed-io.md documentation with the specifications of release 2.70.0-RC4. The changes ensure that all connector configurations are accurately represented and logically organized, providing up-to-date information for users interacting with various data sources and sinks.

Highlights

• Documentation Update: The managed-io.md documentation has been updated to reflect the configurations for release 2.70.0-RC4.
• Configuration Reordering: The order and presentation of various connector configurations, including Kafka, Iceberg CDC, BigQuery, MySQL, and SQL Server, have been significantly restructured within the document.
• New Parameter Added: A new parameter, direct_write_byte_limit, has been added to the Iceberg write configuration details.
• Iceberg CDC Write Unavailable: The Iceberg CDC write configuration is now explicitly marked as 'Unavailable' in the summary table.

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