Merge pull request godotengine#8951 from emre0altan/Clarify-suffix-usage-when-importing-resources-with-ResourceImporterScene

Node type customization warning updated to explain suffix options godotengine#8950

Author: skyace65

tutorials/assets_pipeline/importing_3d_scenes/node_type_customization.rst

@@ -17,7 +17,8 @@ will detect suffixes in object names and will perform actions automatically.
 
 .. warning::
 
-    All the suffixes described below are **case-sensitive**.
+    All the suffixes described below can be used with ``-``, ``$``, and ``_`` and are
+	**case-insensitive**.
 
 Remove nodes (-noimp)
 ^^^^^^^^^^^^^^^^^^^^^