Reword missing annotation error to be a bit clearer

discord/app_commands/commands.py

@@ -377,7 +377,7 @@ def _extract_parameters_from_callback(func: Callable[..., Any], globalns: Dict[s
     parameters: List[CommandParameter] = []
     for parameter in iterator:
         if parameter.annotation is parameter.empty:
-            raise TypeError(f'annotation for {parameter.name} must be given in callback {func.__qualname__!r}')
+            raise TypeError(f'parameter {parameter.name!r} is missing a type annotation in callback {func.__qualname__!r}')
 
         resolved = resolve_annotation(parameter.annotation, globalns, globalns, cache)
         param = annotation_to_parameter(resolved, parameter)