fix prompt

services/Python2To3Migrator.py

@@ -40,7 +40,7 @@ def run_generation(self, retriever, llm, output_parser, clone_dir) -> None:
 
         Here is an example of the expected output for the file migration case:
         ```migrated
-        # Migrated file content
+          ...Migrated file content
         ```
 
         Here are the files that need to be taken into account: