Renaming NotDefined to Undefined

src/Discord.Net.Core/Entities/Invites/TargetUserType.cs

@@ -3,7 +3,7 @@ namespace Discord
     public enum TargetUserType
     {
         /// <summary> The invite target user type is not defined. </summary>
-        NotDefined = 0,
+        Undefined = 0,
         /// <summary> The invite is for a Go Live stream. </summary>
         Stream = 1
     }

src/Discord.Net.WebSocket/Entities/Invites/SocketInvite.cs

@@ -117,7 +117,7 @@ namespace Discord.WebSocket
             MaxUses = model.MaxUses;
             Uses = model.Uses;
             _createdAtTicks = model.CreatedAt.UtcTicks;
-            TargetUserType = model.TargetUserType.IsSpecified ? model.TargetUserType.Value : TargetUserType.NotDefined;
+            TargetUserType = model.TargetUserType.IsSpecified ? model.TargetUserType.Value : TargetUserType.Undefined;
         }
 
         /// <inheritdoc />