Fix index template step in Set up a TSDS

[marciw]

Fixes #3914

• Move lifecycle object to the right place in the example
• Clarify intro text

[github-actions]

🔍 Preview links for changed docs

• manage-data/data-store/data-streams/set-up-tsds.md

[Copilot]

Pull Request Overview

This PR fixes formatting issues in the TSDS setup documentation, specifically in the index template configuration section. The changes address GitHub issue #3914 by correcting the structure of the lifecycle configuration object and improving the clarity of the setup instructions.

• Removed duplicate closing brace from ILM policy example
• Corrected lifecycle object structure in index template example by moving it to the proper location
• Refined introductory text for lifecycle management configuration to be clearer

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[kilfoyle]

LGTM! 🦘

[pquentin]

Thanks! LGTM.

[georgewallace]

Changes look good to me. For the call outs they say stack only. (after the examples) we might want to revisit that . is that the right applies to? I know you didn't edit it. But noticed it.