Update agentchat_function_call_currency_calculator.ipynb (microsoft#2952

)

minor fix

notebook/agentchat_function_call_currency_calculator.ipynb

@@ -224,7 +224,7 @@
     "\n",
     "- objects of the Pydantic BaseModel type are serialized to JSON.\n",
     "\n",
-    "We can check the correctness of of function map by using `._origin` property of the wrapped function as follows:"
+    "We can check the correctness of function map by using `._origin` property of the wrapped function as follows:"
    ]
   },
   {