Update 2. Build out BackEnd and Refactor.md

Author: davidfowl

docs/2. Build out BackEnd and Refactor.md

@@ -661,14 +661,14 @@ Okay, now we need to update our `ApplicationDbContext` so Entity Framework knows
                    FirstName = attendee.FirstName,
                    LastName = attendee.LastName,
                    UserName = attendee.UserName,
-                   Sessions = attendee.Sessions?
+                   Sessions = attendee.SessionsAttendees?
                        .Select(s =>
                            new ConferenceDTO.Session
                            {
-                               ID = s.ID,
-                               Title = s.Title,
-                               StartTime = s.StartTime,
-                               EndTime = s.EndTime
+                               ID = sa.SessionID,
+                               Title = sa.Session.Title,
+                               StartTime = sa.Session.StartTime,
+                               EndTime = sa.Session.EndTime
                            })
                        .ToList(),
                    Conferences = attendee.ConferenceAttendees?