Fix godoc for dsl.Parent
@@ -703,7 +703,7 @@ func Body(args ...interface{}) {
// are automatically merged into the child method payload type if not already
// defined.
//
-// Parent must appear in a Service expression.
+// Parent must appear in the HTTP expresssion of a Service.
//
// Parent accepts one argument: the name of the parent service.
func Parent(name string) {
