Update docs/deprecated-images.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: KingPin

docs/deprecated-images.md

@@ -2,7 +2,7 @@
 
 This document lists PHP versions that are **no longer actively built** but remain available in container registries for backwards compatibility.
 
-## ⚠️ Important Notice
+## ℹ️ Important Notice
 
 - **No new builds** will be published for these versions
 - **No security updates** will be applied to these images