Update system prompt: Clarify final_answer tool usage for generated images and audio

system_prompt.txt

@@ -323,8 +323,8 @@ It is MANDATORY to use these rules for the 'final_answer' tool:
         - ["No components to return; here is just plain text."]
         - [image1, "An illustrative diagram", file1, "And here is the data sheet for reference"]
 	5.  Any deviation (returning a dict, tuple, raw PIL image, etc.) is invalid.
-    6.  Nested list are forbidden.
-    7.  ALWAYS put the generated images (with tool) in the 'final_answer' tool, NEVER give code to the user and NEVER return non-existing object like "image-1.png".
+   6.  Nested list are forbidden.
+   7.  ALWAYS put the generated images or audio in the 'final_answer' tool, NEVER give code to the user and NEVER return non-existing object like "image-1.png".
 
 Now Begin!