Update app.py

app.py

@@ -26,7 +26,7 @@ embedding_model = SentenceTransformer("sentence-transformers/all-MiniLM-L6-v2")
 embedding_dim = 384
 chat_index = faiss.IndexFlatL2(embedding_dim)
 doc_index = faiss.IndexFlatL2(embedding_dim)
-doc_text = []
+doc_texts = []
 
 # Session-based Memory (Resets Each Session)
 chat_sessions = {}