Fix link to MCP server architecture documentation (#639)

Updated the link to MCP server architecture documentation.

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## Motivation and Context
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Fixes #638

## How Has This Been Tested?
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tested? -->

## Breaking Changes
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## Types of changes
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- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
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that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
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Author: rdimitrov

docs/guides/publishing/publish-server.md

@@ -29,7 +29,7 @@ You can make your MCP server available in multiple ways:
 - **🌐 Remote deployment**: Hosted as a web service that clients connect to directly  
 - **🔄 Hybrid deployment**: Offer both package and remote options for maximum flexibility
 
-Learn more about [MCP server architecture](https://modelcontextprotocol.io/docs/concepts/servers) in the official docs.
+Learn more about [MCP server architecture](https://modelcontextprotocol.io/docs/learn/architecture) in the official docs.
 
 ## Step 1: Install the Publisher CLI