Add comments.

src/Volo.Abp/Volo/Abp/AbpKernelModule.cs

@@ -17,6 +17,7 @@ namespace Volo.Abp
             //TODO: Move to a dedicated class
             services.OnExposing(context =>
             {
+                //Register types for IObjectMapper<TSource, TDestination> if implements
                 context.ExposedTypes.AddRange(
                     ReflectionHelper.GetImplementedGenericTypes(
                         context.ImplementationType,

src/Volo.Abp/Volo/Abp/Uow/UnitOfWorkInterceptorRegistrar.cs

@@ -9,6 +9,7 @@ namespace Volo.Abp.Uow
         {
             if (UnitOfWorkHelper.IsUnitOfWorkType(context.ImplementationType.GetTypeInfo()))
             {
+                //TODO: Notice that it may add the interceptor more than one for every exposed service type!?
                 context.Interceptors.Add<UnitOfWorkInterceptor>();
             }
         }