Update docs changelog (for PR #57313) (#57585)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Jules <19994093+jules-p@users.noreply.github.com>
Co-authored-by: hubwriter <hubwriter@github.com>

Author: 4 people

CHANGELOG.md

@@ -29,7 +29,15 @@ See:
 
 **17 September 2025**
 
-We added documentation for expanded features for reusing workflow configurations in GitHub Actions. 
+We've added information about the GitHub MCP Registry, and guidance on how to use it in VS Code.
+
+See [About the GitHub MCP Registry](https://docs.github.com/copilot/concepts/context/mcp#about-the-github-mcp-registry) and [Using the GitHub MCP Registry](https://docs.github.com/copilot/how-tos/provide-context/use-mcp/extend-copilot-chat-with-mcp#using-the-github-mcp-registry).
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+<hr>
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+**17 September 2025**
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+We've added documentation for expanded features for reusing workflow configurations in GitHub Actions. 
 
 You can now use YAML anchors and aliases to reuse pieces of content in a workflow. See [YAML anchors and aliases](https://docs.github.com/actions/concepts/workflows-and-actions/reusing-workflow-configurations#yaml-anchors-and-aliases).