Update app.py

app.py

@@ -24,7 +24,7 @@ with open('config.json') as config_file:
     config = json.load(config_file)
 
 
-PERSIST_DOC_DIRECTORY = config["chroma_doc_data_"]
+PERSIST_DOC_DIRECTORY = config["chroma_doc_data"]
 PERSIST_CODE_DIRECTORY =config["chroma_code_data"]
 CHUNK_SIZE = config["chunk_size"]
 CHUNK_OVERLAP = config["chunk_overlap"]