cosmetic changes

app.py

@@ -153,7 +153,7 @@ def retriever(query: str, selected_retriever: str):
             except:
                 retrieved_document_titles = retrieved_document_titles + document + ' ||| '
 
-        display_retrieved_documents = f" ||| Retrieved Documents - ||| {retrieved_document_titles}"
+        display_retrieved_documents = f"Retrieved Documents - ||| {retrieved_document_titles}"
 
     with st.chat_message("assistant"):
         placeholder = st.empty()