Fix typo in backends.mdx documentation

[dhruv1710]

Overview

Changed Aautomatic to Automatic and matched the sentences context

Type of change

Type: Fix typo

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

Its my first PR for langchain, I love the framework and wanted to give back in any way possible!

[Copilot]

Pull Request Overview

This PR corrects a spelling error in the DeepAgents backends documentation. The change fixes a typo in a list item describing the automatic eviction feature of large tool outputs.