Update rag_engine.py

rag_engine.py

@@ -348,5 +348,5 @@ def process_query(query, top_k=5, word_limit=100):
     """
     return cached_process_query(query, top_k, word_limit)
 
-# Alias for backward compatibility
+# Alias for backward compatibility.
 load_model = cached_load_model