docs[patch]: replace wrong interface API reference link

[froggy1014]

Found out that has wrong API reference link on rag.ipynb

• https://js.langchain.com/v0.2/docs/tutorials/rag#go-deeper-1

please check here Interface external link above.

[AS-IS]

• https://v02.api.js.langchain.com/classes/langchain_text_splitter.TextSplitter.html

• https://v02.api.js.langchain.com/modules/langchain_schema_document.html#BaseDocumentTransformer

[TO-BE]

• https://v02.api.js.langchain.com/classes/langchain_textsplitters.TextSplitter.html

• https://v02.api.js.langchain.com/classes/langchain_core_documents.BaseDocumentTransformer.html

[vercel]

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[jacoblee93]

Thank you very much!