Update docs changelog (for PR #57873) (#57937)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Isaac Brown <101839405+isaacmbrown@users.noreply.github.com>

Author: 3 people

CHANGELOG.md

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 # Docs changelog
 
+**13 October 2025**
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+To help large enterprises keep their automations secure and consistent across many organizations, we published [Automating app installations in your enterprise's organizations](https://docs.github.com/en/enterprise-cloud@latest/admin/managing-github-apps-for-your-enterprise/automate-installations). This is one of the most requested features from customer feedback.
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+The tutorial shows how to manage installations and run automations using enterprise-owned apps and the new apps installation API. Security-conscious enterprises will see that Apps maximize security by providing short-lived, minimally scoped tokens at every stage.
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+<hr>
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 **1 October 2025**
 
 We’ve updated the Spark documentation to support the launch for Copilot Enterprise users, making it easier to understand and enable Spark: