api comments for genres, studios, years, persons

MediaBrowser.Api/UserLibrary/YearsService.cs

@@ -14,6 +14,7 @@ namespace MediaBrowser.Api.UserLibrary
     /// </summary>
     [Route("/Users/{UserId}/Items/{Id}/Years", "GET")]
     [Route("/Users/{UserId}/Items/Root/Years", "GET")]
+    [ServiceStack.ServiceHost.Api(Description = "Gets all years from a given item, folder, or the entire library")]
     public class GetYears : GetItemsByName
     {
     }