DOC: Cosmos DB cache sample has incorrect link to documentation

[dfberry]

Checklist

• I added a very descriptive title to this issue.
• I included a link to the documentation page I am referring to (if applicable).

Issue with current documentation:

The Azure Cosmos DB sample for caches has an incorrect link to the sample. The correct link is: https://aka.ms/CosmosVectorSearch. I'll create a PR for this fix.

Idea or request for content:

No response

[dosubot]

The issue raised by @dfberry highlights that the link to the Azure Cosmos DB sample for caches in the LangChainJS documentation is incorrect. The current link points to a page that is unrelated to Azure Cosmos DB or vector search functionality. The correct link should be updated to ensure accurate documentation. The user plans to create a pull request to address this issue.

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