Fixed stuff

Author: davidfowl

docs/2. Build out BackEnd and Refactor.md

@@ -392,6 +392,10 @@ Okay, now we need to update our `ApplicationDbContext` so Entity Framework knows
                // Many-to-many: Speaker <-> Session
                modelBuilder.Entity<SessionSpeaker>()
                    .HasKey(ss => new { ss.SessionId, ss.SpeakerId});
+                   
+               // Many-to-many: Speaker <-> Session
+               modelBuilder.Entity<SessionSpeaker>()
+                  .HasKey(ss => new { ss.SessionId, ss.SpeakerId });
 
                // Many-to-many: Session <-> Tag
                modelBuilder.Entity<SessionTag>()