use @function_tool decorator in docs

docs/agents.md

@@ -13,14 +13,15 @@ The most common properties of an agent you'll configure are:
 ```python
 from agents import Agent, ModelSettings, function_tool
 
+@function_tool
 def get_weather(city: str) -> str:
     return f"The weather in {city} is sunny"
 
 agent = Agent(
     name="Haiku agent",
     instructions="Always respond in haiku form",
     model="o3-mini",
-    tools=[function_tool(get_weather)],
+    tools=[get_weather],
 )
 ```
 

docs/context.md

@@ -36,6 +36,7 @@ class UserInfo:  # (1)!
     name: str
     uid: int
 
+@function_tool
 async def fetch_user_age(wrapper: RunContextWrapper[UserInfo]) -> str:  # (2)!
     return f"User {wrapper.context.name} is 47 years old"
 
@@ -44,7 +45,7 @@ async def main():
 
     agent = Agent[UserInfo](  # (4)!
         name="Assistant",
-        tools=[function_tool(fetch_user_age)],
+        tools=[fetch_user_age],
     )
 
     result = await Runner.run(