Fixed issues in XMLDocs introduced by various updates

Notably, renaming the tests introduced some broken references in view models that referred to the tests they were associated with. In those cases, I simply removed the reference, as there are easier ways of figuring out what tests reference a test model. While I was at it, also clarified the description for `TopicReferenceAttribute` and `TextAttribute` view models.

Author: JeremyCaney

OnTopic.Tests/ViewModels/DisableMappingTopicViewModel.cs

@@ -11,7 +11,7 @@ namespace OnTopic.Tests.ViewModels {
   | VIEW MODEL: DISABLE MAPPING
   \---------------------------------------------------------------------------------------------------------------------------*/
   /// <summary>
-  ///   Provides a simple view model with a single property (<see cref="Key") which is annotated with the <see
+  ///   Provides a simple view model with a single property (<see cref="Key" />) which is annotated with the <see
   ///   cref="DisableMappingAttribute"/>.
   /// </summary>
   /// <remarks>

OnTopic.Tests/ViewModels/Metadata/AttributeDescriptorTopicViewModel.cs

@@ -11,7 +11,7 @@ namespace OnTopic.Tests.ViewModels.Metadata {
   \---------------------------------------------------------------------------------------------------------------------------*/
   /// <summary>
   ///   Provides a strongly-typed data transfer object for testing view models with properties that map to custom collections
-  ///   on the source <see cref="Topic"/>, as part of <see cref="TopicMappingServiceTest.CustomCollection"/>.
+  ///   on the source <see cref="Topic"/>.
   /// </summary>
   /// <remarks>
   ///   This is a sample class intended for test purposes only; it is not designed for use in a production environment.

OnTopic.Tests/ViewModels/Metadata/TextAttributeTopicViewModel.cs

@@ -3,15 +3,16 @@
 | Client        Ignia, LLC
 | Project       Topics Library
 \=============================================================================================================================*/
+using OnTopic.Metadata.AttributeTypes;
 
 namespace OnTopic.Tests.ViewModels.Metadata {
 
   /*============================================================================================================================
   | VIEW MODEL: TEXT ATTRIBUTE (DESCRIPTOR)
   \---------------------------------------------------------------------------------------------------------------------------*/
   /// <summary>
-  ///   Provides a strongly-typed data transfer object for testing view models with properties that map to custom collections
-  ///   on the source <see cref="Topic"/>, as part of <see cref="TopicMappingServiceTest.CustomCollection"/>.
+  ///   Provides a dummy implementation of a view model for an <see cref="AttributeTypeDescriptor"/> view model, in order to
+  ///   allow the dynamic resolution of mapping <see cref="TextAttribute"/> topics to view models.
   /// </summary>
   /// <remarks>
   ///   This is a sample class intended for test purposes only; it is not designed for use in a production environment.

OnTopic.Tests/ViewModels/Metadata/TopicReferenceAttributeTopicViewModel.cs

@@ -3,15 +3,16 @@
 | Client        Ignia, LLC
 | Project       Topics Library
 \=============================================================================================================================*/
+using OnTopic.Metadata.AttributeTypes;
 
 namespace OnTopic.Tests.ViewModels.Metadata {
 
   /*============================================================================================================================
   | VIEW MODEL: TOPIC REFERENCE ATTRIBUTE (DESCRIPTOR)
   \---------------------------------------------------------------------------------------------------------------------------*/
   /// <summary>
-  ///   Provides a strongly-typed data transfer object for testing view models with properties that map to custom collections
-  ///   on the source <see cref="Topic"/>, as part of <see cref="TopicMappingServiceTest.CustomCollection"/>.
+  ///   Provides a dummy implementation of a view model for an <see cref="AttributeTypeDescriptor"/> view model, in order to
+  ///   allow the dynamic resolution of mapping <see cref="TopicReferenceAttribute"/> topics to view models.
   /// </summary>
   /// <remarks>
   ///   This is a sample class intended for test purposes only; it is not designed for use in a production environment.