Improve Kafka MSK docs with IAM and connectivity details.

[amolsr]

Summary

Added IAM policy and updated the networking for MSK Connect.

Closes ClickHouse/clickhouse-kafka-connect#609

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

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Project	Deployment	Preview	Comments	Updated (UTC)
clickhouse-docs	Error			Oct 13, 2025 6:34pm

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