Update supported features of MongoDBAtlasVectorSearch

[Jibola]

Overview

Updating vectorstore docs to confirm multi-tenant and standard tests support on the MongoDBAtlasVectorSearch class

Type of change

Type: Update existing documentation

Related issues/PRs

• GitHub issue:
• Feature PR:

• Linear issue:
• Slack thread:

Checklist

• I have read the contributing guidelines
• I have tested my changes locally using docs dev
• All code examples have been tested and work correctly
• I have used root relative paths for internal links
• I have updated navigation in src/docs.json if needed
• I have gotten approval from the relevant reviewers
• (Internal team members only / optional) I have created a preview deployment using the Create Preview Branch workflow

Additional notes

[vercel]

@Jibola is attempting to deploy a commit to the LangChain Team on Vercel.

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[Copilot]

Pull Request Overview

This PR updates the vectorstore documentation to acknowledge that MongoDBAtlasVectorSearch now supports multi-tenant and standard tests functionality. The change corrects the support matrix table to reflect the current capabilities.

Key Changes

• Updated MongoDBAtlasVectorSearch support indicators in the vectorstore comparison table