Update app.py

app.py

@@ -1,6 +1,7 @@
 """
-Question Answering with Retrieval QA and LangChain Language Models featuring Chroma Vector Stores
-This script uses the LangChain Language Model API to answer questions using Retrieval QA and Chroma Vector Stores.
+Question Answering with Retrieval QA and LangChain Language Models featuring FAISS vector stores.
+This script uses the LangChain Language Model API to answer questions using Retrieval QA 
+and FAISS vector stores. It also uses the OpenAI API to generate responses.
 """
 
 import os