Update toggle block comment documentation.

src/EditorFeatures/Core/Implementation/CommentSelection/IToggleBlockCommentDocumentDataProvider.cs

@@ -10,8 +10,6 @@ interface IToggleBlockCommentDocumentDataProvider
         /// <summary>
         /// Gets the location to insert an empty comment.
         /// </summary>
-        /// <param name="location"></param>
-        /// <returns></returns>
         int GetEmptyCommentStartLocation(int location);
 
         /// <summary>

src/EditorFeatures/Core/Implementation/CommentSelection/ToggleBlockCommentCommandHandler.cs

@@ -77,6 +77,9 @@ public bool ExecuteCommand(CommentSelectionCommandArgs args, CommandExecutionCon
             return emptyResult;
         }
 
+        /// <summary>
+        /// Retrieves data about the commented selection that can be optionally overriden by subclasses.
+        /// </summary>
         protected virtual async Task<IToggleBlockCommentDocumentDataProvider> GetBlockCommentDocumentData(Document document, ITextSnapshot snapshot,
             CommentSelectionInfo commentInfo, CancellationToken cancellationToken)
         {