TiCDC 处理大事务相关的 FAQ 需更新

[asddongmen]

Change Request

This repository is ONLY used to solve problems related to DOCS-CN.
For other issues (TiDB, TiKV, etc), please move to other repositories.

Please answer the following questions before submitting your issue. Thanks!

1. Describe what you find is inappropriate or missing in the existing docs.

当前 cdc 已经可以支持大事务，需要对该部分描述进行更新。
https://docs.pingcap.com/zh/tidb/dev/ticdc-faq#ticdc-%E6%94%AF%E6%8C%81%E5%90%8C%E6%AD%A5%E5%A4%A7%E4%BA%8B%E5%8A%A1%E5%90%97%E6%9C%89%E4%BB%80%E4%B9%88%E9%A3%8E%E9%99%A9%E5%90%97

2. Describe your suggestion or addition.

3. Provide some reference materials (documents, websites, etc) if you could.

[shichun-0415]

This issue has been resolved after #11123.