update prompt for zero shot

app.py

@@ -806,7 +806,7 @@ Observation: the result of the action
 Thought: I now know the final answer
 Final Answer: the final answer to the original input question"""
 
-FORMAT_INSTRUCTIONS_3 = """To use a tool, you must define 'Action' and 'Action Input'.
+FORMAT_INSTRUCTIONS_3 = """Each time to use a tool, you must define 'Action' and 'Action Input'.
 please use the following format:
 '''
 Thought: you should always think about what to do