Update app.py

app.py

@@ -13,7 +13,7 @@ def population(country_name:str)-> str: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that does get the most recent number of people of a specific country. 
     Args:
-        country name: A string representing the name of a specific country (e.g., 'Brazil').
+        country_name: A string representing the name of a specific country (e.g., 'Brazil').
     """
     return f"The population of country_name is number people (source_name, year)."