docs: clarify binlog deprecation in TLS guide (#3175)

[ti-chi-bot]

This is an automated cherry-pick of #3175

Summary

• add TiDB Binlog deprecation warnings to the Pump and Drainer sections of the TLS guide
• clarify that the importer-related certificates are for the TiDB Lightning local backend (TiKV Importer)
• update both English and Chinese docs on release-1.6

Validation

• reviewed the scoped git diff
• ran git diff --check

Summary by CodeRabbit

• Documentation
  • Clarified that TiKV Importer certificates are required only when restoring data with TiDB Lightning’s local backend.
  • Updated component naming to “TiDB Lightning local backend (TiKV Importer)” in TLS configuration guidance.
  • Added deprecation and removal notices for Pump and Drainer, with TiCDC recommended for incremental data synchronization.
  • Applied these updates to both English and Chinese documentation.

[ti-chi-bot]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: c0ee09f7-765d-448e-9d53-68881ae89b4e

📥 Commits

Reviewing files that changed from the base of the PR and between 7f66324 and a9d4760.

📒 Files selected for processing (2)

• en/enable-tls-between-components.md
• zh/enable-tls-between-components.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The English and Chinese TLS guides clarify that TiKV Importer certificates apply to the TiDB Lightning local backend. They also add TiDB Binlog deprecation warnings for Pump and Drainer sections.

Changes

TLS documentation updates

Layer / File(s)	Summary
TiDB Lightning certificate scope en/enable-tls-between-components.md, zh/enable-tls-between-components.md	The guides rename TiKV Importer references and limit the related certificate requirement to TiDB Lightning’s local backend.
TiDB Binlog deprecation warnings en/enable-tls-between-components.md, zh/enable-tls-between-components.md	The Pump and Drainer sections state the TiDB Binlog deprecation timeline and recommend TiCDC for incremental replication.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~8 minutes

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main documentation change: clarification of TiDB Binlog deprecation in the TLS guide.
Description check	✅ Passed	The description explains the changes and validation steps. It also states that the updates apply to release-1.6, although it does not select the corresponding template checkbox or provide reference li…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create a new PR

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_{A rabbit reads the TLS guide,
Importer names now stand beside
Lightning’s local path,
Binlog warnings mark the past,
TiCDC hops where new streams glide.}

_{Comment @coderabbitai help to get the list of available commands.}

[ti-chi-bot]

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