Add note to prerequisites to using Copilot Spaces in the IDE

[dmsmi]

Code of Conduct

• 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/provide-context/use-copilot-spaces/use-copilot-spaces

What part(s) of the article would you like to see updated?

There was a recent change to the GitHub MCP Server that removes Copilot Spaces as a default tool when the MCP Server is installed. As a result, users are now confused on how to use Copilot Spaces in their MCP Client. We want to update the public docs to inform users on how they can add Copilot Spaces as a toolset to the GitHub MCP Server so they're aware of how they need to configure their environment.

Additional information

No response

[welcome]

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