add type to doc comment for lastModified value
add type to doc comment for lastModified value

wshafer/AssetManager,pensiero/AssetManager,pensiero/AssetManager,chaos0815/AssetManager,wshafer/AssetManager,chaos0815/AssetManager,hummer2k/AssetManager,RWOverdijk/AssetManager,hummer2k/AssetManager,RWOverdijk/AssetManager