API Center MCP register URL is hard to know

[luizbon]

Code of Conduct

• [x] I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/copilot/how-tos/administer-copilot/configure-mcp-server-access

What changes are you suggesting?

Adding the API Center MCP registry URL to the documentation.

Additional information

The URL is not documented anywhere, I needed to find it by reverse engineering the Portal web app.

[github-actions[bot]]

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