lake: update heading format for consistent style

[lilin90]

What is changed, added or deleted? (Required)

Updated heading format for style consistency in several files.

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• v9.0 (TiDB 9.0 versions)
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• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
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Summary by CodeRabbit

• Documentation
  • Standardized tutorial step heading punctuation across loading guides.
  • Corrected wording in the Parquet loading guide, including “Optional” in a step heading.
  • Updated tutorial links to use the correct anchor format.
  • Improved consistency and readability of Markdown headings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 3bc05f2c-c0ca-4fc9-b332-778f89502a86

📥 Commits

Reviewing files that changed from the base of the PR and between b32740d and bd7750a.

📒 Files selected for processing (1)

• tidb-cloud-lake/guides/load-from-local-file.md

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📝 Walkthrough

Walkthrough

Updated headings in three TiDB Cloud loading guides. The changes standardize tutorial and step punctuation, correct “Option” to “Optional,” and update Tutorial 1 anchor references.

Changes

Tutorial heading formatting

Layer / File(s)	Summary
Heading punctuation, wording, and anchors tidb-cloud-lake/guides/load-from-local-file.md, tidb-cloud-lake/guides/load-from-stage.md, tidb-cloud-lake/guides/load-parquet.md	Updated tutorial and step heading punctuation. Corrected “Option” to “Optional” and updated Tutorial 1 anchor references.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating heading format for consistent style in Lake documentation.
Description check	✅ Passed	The description includes the required change summary, affected version, links, AI involvement, and change-type sections; reference links are blank but non-critical.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: b1ed5b5e-c0e8-4386-9868-fd1c83617883

📥 Commits

Reviewing files that changed from the base of the PR and between 84444c6 and b32740d.

📒 Files selected for processing (3)

• tidb-cloud-lake/guides/load-from-local-file.md
• tidb-cloud-lake/guides/load-from-stage.md
• tidb-cloud-lake/guides/load-parquet.md

[lilin90]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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