Update app.py

app.py

@@ -12,7 +12,7 @@ def spell_checker(sentence: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 correct the errors in the spelling 
     Args:
-        arg1: the sentence to be corrected
+        sentence: the sentence to be corrected
     """
     try:
         # corrected sentence