Update resources.md

fixed line 255 :::NOTE to :::note to meet Docusaurus processing requirements

Author: IvanTheGeek

docs/guides/styles-and-resources/resources.md

@@ -252,7 +252,7 @@ The search moves upwards in the logical control tree, behaving at each level in
 
 Avalonia provides different options to access Resources from code. 
 
-:::NOTE
+:::note
 
 `ResourceNode` in the below samples can be any node that supports `Resource`, like `Appliction.Current`, `Window`, `UserControl`, ...