Fixed links to GitHub MCP server documentation

[SteveEdson]

Why:

Closes: #41347

What's being changed (if available, include any code snippets, screenshots, or gifs):

Fixed links

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• x ] The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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Source	Review	Production	What Changed
copilot/how-tos/provide-context/use-mcp/set-up-the-github-mcp-server.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull Request Overview

This PR fixes broken links to the GitHub MCP server documentation by updating the repository path from /mcp/github/github-mcp-server to /mcp/io.github.github/github-mcp-server. The issue was tracked in #41347.

Key Changes:

• Updated 5 external link URLs to the GitHub MCP server documentation with the correct repository path
• Changes span multiple IDE setup sections (VS Code, Visual Studio, JetBrains, Xcode)

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[github-actions]

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