Update agents.ipynb (microsoft#3979)

a mistake about in User Guide sector

python/packages/autogen-core/docs/src/user-guide/agentchat-user-guide/tutorial/agents.ipynb

@@ -230,7 +230,7 @@
     "\n",
     "A common example is an agent that can be part of a team but primarily is driven by human input. Other examples include agents that respond with specific text, tool or function calls. \n",
     "\n",
-    "In the example below we show hot to implement a `UserProxyAgent` - an agent that asks the user to enter some text and then returns that message as a response.  "
+    "In the example below we show how to implement a `UserProxyAgent` - an agent that asks the user to enter some text and then returns that message as a response.  "
    ]
   },
   {