Clarify comments for methods added in r178921

Source/core/dom/ContainerNode.h

Index: Source/core/dom/ContainerNode.h
diff --git a/Source/core/dom/ContainerNode.h b/Source/core/dom/ContainerNode.h
index 30b2d5d4055b9277a1d5610fdce4240c96950546..58c92228579c5dc458f55e43ee0d8cfd9c590dd5 100644
--- a/Source/core/dom/ContainerNode.h
+++ b/Source/core/dom/ContainerNode.h
@@ -186,8 +186,8 @@ protected:
     void setLastChild(Node* child) { m_lastChild = child; }
 
 private:
-    bool isContainerNode() const WTF_DELETED_FUNCTION; // Hide to catch useless calls.
-    bool isTextNode() const WTF_DELETED_FUNCTION; // Hide to catch useless calls.
+    bool isContainerNode() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
+    bool isTextNode() const WTF_DELETED_FUNCTION; // This will catch anyone doing an unnecessary check.
 
     void removeBetween(Node* previousChild, Node* nextChild, Node& oldChild);
     void insertBeforeCommon(Node& nextChild, Node& oldChild);