Adding docstring to get_weather tool (openai#1231)

Author: mutahirshah11

docs/agents.md

@@ -16,6 +16,7 @@ from agents import Agent, ModelSettings, function_tool
 
 @function_tool
 def get_weather(city: str) -> str:
+ """returns weather info for the specified city."""
  return f"The weather in {city} is sunny"
 
 agent = Agent(