Update README.md

Author: D1M1TR10S

README.md

@@ -4,7 +4,8 @@ This SDK simplifies the process of building an GitHub Copilot Extension as an ag
 
 We consider this SDK alpha software in terms of API stability, but we adhere to semantic-versioning, so it's safe to use today.
 
-> Note: This SDK does not apply to skillset extensions. It only applies to developing an agent extension. For more info, see the [docs on skillsets and agents](https://docs.github.com/en/copilot/building-copilot-extensions/about-building-copilot-extensions#about-skillsets-and-agents).
+> [!NOTE]
+> This SDK does not apply to skillset-based extensions. It only applies to building an agent. For more info, see the [docs on skillsets and agents](https://docs.github.com/en/copilot/building-copilot-extensions/about-building-copilot-extensions#about-skillsets-and-agents).
 
 ## Key features