ticdc: adjust TOC and reorganize troubleshooting & faq

[shichun-0415]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Suggestion from Allen Gao:

• Troubleshoot 部分按照内容分为Troubleshooting 和 FAQ。
• 对于 TiCDC OpenAPI，TiCDC Open Protocol，TiCDC Canal-JSON Protocol 部分建议都放到一个叫“Reference” 的目录下吧。

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For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v6.2 (TiDB 6.2 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lilin90

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[zier-one]

LGTM

[lilin90]

I made some changes in bef0e0d, trying to keep the TOC logic consistent between the TiDB TOC and tool's TOC. @shichun-0415 Please help update accordingly for the English version in pingcap/docs#9166. Thanks!

[lilin90]

LGTM

[lilin90]

Please DO NOT use such general wording for titles of a specific tool.

[lilin90]

LGTM

[shichun-0415]

/remove status LGT1
/status LGT2

[shichun-0415]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: cb388eb

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #10166.