[Web Bot Auth] Update documentation in web-bot-auth.mdx

[AkshatM]

• Resolves Mention a debug endpoint for Web Bot Auth #23334

Documentation checklist

• [ x] The documentation style guide has been adhered to.

[hyperlint-ai]

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PR Change Summary

Updated documentation for web-bot-auth to include testing information for signed requests.

• Added a note on testing signed requests using a specific endpoint.
• Clarified the expected HTTP response codes for different scenarios.

Modified Files

• src/content/docs/bots/concepts/bot/verified-bots/web-bot-auth.mdx

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