Fix typo in create_jwt.dart

Co-authored-by: Mouad Debbar <[email protected]>

Author: ditman

packages/google_sign_in/google_sign_in_web/example/integration_test/src/create_jwt.dart

@@ -9,7 +9,7 @@ import 'package:jose/jose.dart';
 
 import 'jsify_as.dart';
 
-/// Wraps a key-value map of [claims] in a JWT token similar GIS'.
+/// Wraps a key-value map of [claims] in a JWT token similar to GIS'.
 ///
 /// Note that the encryption of this token is weak, and this method should
 /// only be used for tests!