Fix Sanic.handle_exception Method's Type Doc (#2333)

* Fix type doc

* Remove explicit type defines in docstring

sanic/app.py

@@ -724,9 +724,7 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
         A handler that catches specific exceptions and outputs a response.
 
         :param request: The current request object
-        :type request: :class:`SanicASGITestClient`
         :param exception: The exception that was raised
-        :type exception: BaseException
         :raises ServerError: response 500
         """
         await self.dispatch(