Update 3.4.-Attributes.md

Author: ccbogel

docs/doc/en/3.4.-Attributes.md

@@ -20,7 +20,7 @@ Attributes can also be added or deleted using the Manage > Manage Attributes opt
 
 <img width="623" height="501" alt="image" src="https://github.com/user-attachments/assets/513af5f1-a94e-4606-b4d0-54011a8607da" />
 
-In this area you can delete attributes. But even though you can delete reference attributes, we recommend that you do not do this, unless you are certain all your references are not needed. These are prefixed with 'Ref_'.
+In this area you can delete attributes. But even though you can delete reference attributes, we recommend that you do not do this, unless you are certain all your references are not needed. These are prefixed with 'Ref_' and are associated with imported refernces that link a file to a specific refernce.