[Agents] Add instruction on adding DO binding

[harshil1712]

Summary

Adds instructions on adding Durable Objects bindings to wrangler file.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Added instructions for integrating Durable Objects bindings into the wrangler file for the Agents SDK.

• Introduced instructions for adding Durable Objects bindings to the wrangler file.
• Updated the example code to include Durable Objects configuration.

Modified Files

• src/content/docs/agents/index.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/agents/	@irvinebroque, @rita3ko, @elithrar, @thomasgauvin, @threepointone, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://9765463e.preview.developers.cloudflare.com
Preview Branch URL: https://agents-minor-update.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/agents/	https://agents-minor-update.preview.developers.cloudflare.com/agents/