Fix broken external documentation links

[qiancai]

What is changed, added or deleted? (Required)

• Update the LangChain vector store documentation link in ai/integrations/vector-search-integrate-with-langchain.md to the current LangChain vector store integrations page.
• Update the Debezium MySQL data type mapping link in ticdc/ticdc-debezium.md from the archived 2.4 path to the stable documentation path.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):
  • https://docs.langchain.com/oss/python/integrations/vectorstores
  • https://debezium.io/documentation/reference/stable/connectors/mysql.html#mysql-data-types

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Code Review

This pull request updates documentation links in the LangChain integration and TiCDC Debezium guides, changing a specific sample code link to a general integrations link and updating a Debezium reference version to 'stable'. The review comments suggest minor grammatical and stylistic improvements, such as adding the definite article 'the' before 'LangChain documentation' and removing filler words like 'basically' and 'generally' to enhance clarity and conciseness.

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[qiancai]

TBD

[ti-chi-bot]

@qiancai: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	fafbbdd	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

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