Update docs changelog (for PR #60757) (#60868)

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CHANGELOG.md

@@ -1,5 +1,14 @@
 # Docs changelog
 
+**21 April 2026**
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+We recently published two new guides for organizations adopting Copilot cloud agent.
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+* Pre-enablement: [Building guardrails for GitHub Copilot cloud agent](https://docs.github.com/en/enterprise-cloud@latest/copilot/tutorials/cloud-agent/build-guardrails) helps you expand built-in protections to create a secure environment for agents to operate in.
+* Post-enablement: [Giving GitHub Copilot cloud agent access to resources in your organization](https://docs.github.com/en/enterprise-cloud@latest/copilot/tutorials/cloud-agent/give-access-to-resources) helps you get more out of Copilot by giving it access to MCP servers and internal packages, while promoting secure, consistent practices.
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+<hr>
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 **15 April 2026**
 
 LSP servers greatly improve Copilot CLI's ability to work with your code. For example, when Copilot renames a symbol throughout a project it can do this more quickly and reliably if it has access to an LSP server for the language the code is written in.