Update entity_relationship_generator.py

entity_relationship_generator.py

@@ -423,7 +423,7 @@ def generate_entity_relationship_diagram(json_input: str, output_format: str) ->
     }
 
     Returns:
-        str: The filepath to the generated PNG image file.
+        str: The filepath to the generated image file.
     """
     try:
         if not json_input.strip():