Fix comments.

Author: PatrykOlejniczak

DataStructures/Trees/BinarySearchTreeNode.cs

@@ -1,5 +1,4 @@
-
-namespace DataStructures.Trees
+namespace DataStructures.Trees
 {
     /// <summary>
     /// The binary search tree node.

DataStructures/Trees/RedBlackTree.cs

@@ -465,7 +465,7 @@ protected bool _remove(RedBlackTreeNode<TKey> nodeToDelete)
                 return false;
             }
 
-            // Node X moves to the original nodeToDelete position in the tree.
+            // X it's node that will become move to original nodeToDelete position in the tree.
             RedBlackTreeNode<TKey> x;
 
             if (nodeToDelete.HasOnlyRightChild)
@@ -480,7 +480,7 @@ protected bool _remove(RedBlackTreeNode<TKey> nodeToDelete)
             }
             else
             {
-                // Node Y moves to the original node X position in the tree.
+                // Y it's node that will become move to original X position in the tree.
                 var y = (RedBlackTreeNode<TKey>)_findMinNode(nodeToDelete.RightChild);
                 x = y.RightChild;
 
@@ -523,7 +523,7 @@ protected bool _remove(RedBlackTreeNode<TKey> nodeToDelete)
         /// <summary>
         ///     Insert one subtree in the place of the other in his parent.
         /// </summary>
-        /// <param name="replaced">Subtree replaced by <param name="replacement">.</param></param>
+        /// <param name="replaced">Subtree of node will be replaced by <param name="replacement">.</param></param>
         /// <param name="replacement">Subtree replaces <param name="replaced">.</param></param>
         private void Transplant(RedBlackTreeNode<TKey> replaced, RedBlackTreeNode<TKey> replacement)
         {

UnitTest/DataStructuresTests/RedBlackTreeTest.cs

@@ -371,7 +371,7 @@ public void Remove_CurrentRoot()
         [Fact]
         public void Remove_ThrowExceptionWhenTryRemoveNonExistentNode()
         {
-            //TODO Create more specyfic exception type for this kind of errors.
+            //TODO Create more specyfic exception type for this kind of errors, with inheritance from ArgumentException.
             Assert.Throws<Exception>(() =>redBlackTree.Remove(999));
         }
     }