add route-handlers-execution-rules example

Former-commit-id: 95e3dfad33b98d20b761ea1d06dee8df91c3632d

_examples/routing/writing-a-middleware/globally/main.go

@@ -22,7 +22,7 @@ func main() {
 	// are applied to existing routes and future routes.
 	//
 	// Remember: the `Use` and `Done` are applied to the current party's and its children,
-	// so if we used the `app.Use/Don`e before the routes registration
+	// so if we used the `app.Use/Done` before the routes registration
 	// it would work like UseGlobal/DoneGlobal in this case, because the `app` is the root party.
 	//
 	// See `app.Party/PartyFunc` for more.