What is the purpose of this change?

This change improves the documentation for creating gateways and using the MCP gateway by adding missing information, clarifying existing content, and ensuring consistent formatting across documentation pages.

How was this change implemented?

High-level changes include:

• Added gateway_id parameter documentation to the create-gateways page, including an info box explaining its importance for preventing conflicts
• Improved the MCP gateway documentation with clearer formatting, better troubleshooting structure, and more consistent presentation
• Enhanced the REST gateway documentation with a comprehensive API reference and example workflow
• Added detailed curl commands for API interactions

How was this change tested?

• Manual testing: Validated documentation renders correctly in the docs website
• Unit tests: Not applicable for documentation changes
• Integration tests: Not applicable
• Known limitations: The documentation assumes basic knowledge of gateway concepts

Is there anything the reviewers should focus on/be aware of?

Please check the formatting of code examples and tables in the REST gateway section to ensure proper rendering in the docs site.