Fix MCP servers settings location: under Copilot > Cloud Agent

[Ameausoone]

Why:

Closes: #45011

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

The repository-level MCP configuration steps referenced a separate MCP servers sidebar item under repo Settings > Copilot. In the current UI, that setting is actually under Copilot > Cloud Agent, in the "Model Context Protocol (MCP)" section. Updated both occurrences of the navigation steps in configure-mcp-servers.md to match.

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.
• 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.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
copilot/how-tos/copilot-on-github/customize-copilot/configure-mcp-servers.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

Updates the repository settings navigation in the MCP servers documentation to match the current GitHub UI location under Copilot settings.

Changes:

• Replaces the outdated Copilot > MCP servers navigation path with Copilot > Cloud Agent.
• Clarifies where to find the “Model Context Protocol (MCP)” section on the Cloud Agent page.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

[Sharra-writes]

@Ameausoone This looks correct based on my own account, but it looks like it needs to be rebased.