Minor clean up and remove unsued classes

Author: DavideD

hibernate-reactive-core/src/main/java/org/hibernate/reactive/engine/jdbc/mutation/internal/ReactiveValueBindings.java

@@ -33,7 +33,7 @@ public ReactiveEntityManagerFactoryBuilder(PersistenceUnitDescriptor persistence
         super( persistenceUnitDescriptor, integration );
     }
 
-    //Overridden so to use a customized serviceregistry: see ReactiveServiceRegistryBuilder
+    //Overridden so to use a customized service registry: see ReactiveServiceRegistryBuilder
     @Override
     protected StandardServiceRegistryBuilder getStandardServiceRegistryBuilder(BootstrapServiceRegistry bsr) {
         return ReactiveServiceRegistryBuilder.forJpa( bsr );