fixed document typo

Author: TakesxiSximada

docs/creating.rst

@@ -95,5 +95,5 @@ Any validating function that validates against a subschema should call
 :meth:`ValidatorMixin.descend`, rather than :meth:`ValidatorMixin.iter_errors`.
 If it recurses into the instance, or schema, it should pass one or both of the
 ``path`` or ``schema_path`` arguments to :meth:`ValidatorMixin.descend` in
-order to properly maintain where in the instance or schema respsectively the
+order to properly maintain where in the instance or schema respectively the
 error occurred.