Made some tweaks to session2

Author: davidfowl

docs/2. Build out BackEnd and Refactor.md

@@ -193,6 +193,8 @@ We're also going to take this opportunity to rename the `Models` directory in th
        public class Session : ConferenceDTO.Session
        {
            public virtual ICollection<SessionSpeaker> SessionSpeakers { get; set; }
+
+           public virtual ICollection<SessionAttendee> SessionAttendees { get; set; }
 
            public Track Track { get; set; }
        }
@@ -311,7 +313,6 @@ Okay, now we need to update our `ApplicationDbContext` so Entity Framework knows
     {
         public class SpeakerResponse : Speaker
         {
-            // TODO: Set order of JSON properties so this shows up last not first
             public ICollection<Session> Sessions { get; set; } = new List<Session>();
         }
     }
@@ -394,15 +395,15 @@ Okay, now we need to update our `ApplicationDbContext` so Entity Framework knows
 1. Copy the `DataLoader.cs` class from [here](/src/BackEnd/Data/DataLoader.cs) into the `Data` directory of the `BackEnd` project.
 1. Copy the `SessionizeLoader.cs` and `DevIntersectionLoader.cs` classes from [here](/src/BackEnd/Data/) into the current project's `/src/BackEnd/Data/` directory. 
  > Note: We have data loaders from the two conference series where this workshop has been presented most; you can update this to plug in your own conference file format.
-1. Turn enums as strings by changing `AddSwaggerGen` in `Startup.cs` to the following:
-    ```
+1. To improve the UI for upload, turn on the option to display enums as strings by changing `AddSwaggerGen` in `Startup.cs` to the following:
+    ```c#
     services.AddSwaggerGen(options =>
     {
         options.SwaggerDoc("v1", new OpenApiInfo { Title = "Conference Planner API", Version = "v1" });
         options.DescribeAllEnumsAsStrings();
     });
     ```
 1. Run the application to see the updated data via Swagger UI.
-1. Use the Swagger UI to upload [NDC_London_2019.json](/src/BackEnd/Data/Import/NDC_London_2019.json) to the `/api/Conferences/upload` API.
+1. Use the Swagger UI to upload [NDC_Oslo_2019.json](/src/BackEnd/Data/Import/NDC_Oslo_2019.json) to the `/api/Sessions/upload` API.
 
 **Next**: [Session #3 - Front-end](3.%20Add%20front-end%2C%20render%20agenda%2C%20set%20up%20front-end%20models.md) | **Previous**: [Session #1 - Setup, basic EF model](/docs/1.%20Create%20BackEnd%20API%20project.md)