docs: fix Sanity mcp url

[tingwai]

Description

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Updated the Sanity MCP cookbook guide to point all references to the correct blog article URL, replacing /blog/model-context-protocol with /blog/introducing-sanity-model-context-protocol-server. Also cleaned up minor whitespace in example blocks for consistency.

^{Written for commit 9f0cd30. Summary will update automatically on new commits.}

[github-actions]

✅ Review Complete

Code Review Summary

⚠️ Continue configuration error. Please verify that the assistant exists in Continue Hub.

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[cubic-dev-ai]

No issues found across 1 file