feat: update script message with emojis (#453)

Author: LeahMarieBush

scripts/update-mdx-files.sh

@@ -21,8 +21,10 @@ fi
 NOTIFICATION_FILE=$(mktemp)
 cat > "$NOTIFICATION_FILE" << 'EOF'
 
+⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️
 > [!IMPORTANT]  
 > **Documentation Update:** Product documentation previously located in `/website` has moved to the [`hashicorp/web-unified-docs`](https://github.com/hashicorp/web-unified-docs) repository, where all product documentation is now centralized. Please make contributions directly to `web-unified-docs`, since changes to `/website` in this repository will not appear on developer.hashicorp.com.
+⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️
 EOF
 
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