Update docs changelog (for PR #56101) (#56360)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: hubwriter <hubwriter@github.com>
Co-authored-by: Sarita Iyer <66540150+saritai@users.noreply.github.com>

Author: 4 people

CHANGELOG.md

@@ -12,6 +12,12 @@ Get started at [Achieving your company's engineering goals with GitHub Copilot](
 
 **27 June 2025**
 
+We've published a new guide about how to combine use of GitHub Copilot's agent mode with Model Context Protocol (MCP) servers to complete complex tasks through agentic "loops" - illustrated through an accessibility compliance example. The guide also discusses best practices and benefits around using these two features together. See [Enhancing Copilot agent mode with MCP](https://docs.github.com/copilot/tutorials/enhancing-copilot-agent-mode-with-mcp).
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+**27 June 2025**
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 We’ve published a new set of new documentation articles designed to help users make the most of the **Dependabot metrics page** in the organization’s security overview.
 
 These clear, actionable guides help users: