Update decapitalize.md

snippets/decapitalize.md

@@ -9,11 +9,11 @@ Decapitalize the first letter of the string and then add it with rest of the str
 Omit the `upper_rest` parameter to keep the rest of the string intact, or set it to `True` to convert to uppercase.
 
 ```py
-def decapitalize(string, upper_rest=False):
+def decapitalize(str, upper_rest=False):
   return str[:1].lower() + (str[1:].upper() if upper_rest else str[1:])
 ```
 
 ```py
 decapitalize('FooBar') # 'fooBar'
 decapitalize('FooBar', True) # 'fOOBAR'
-```
+```