Clarify Node vs NodeList method docs

Node and NodeList both import methods from DOM.  The doc comments seem to have been written for NodeList and copy/pasted for Node.  It didn't make sense for a Node method to act on 'each node' so the wording has been clarified.

src/node/js/node-class.js

@@ -5,32 +5,32 @@
 
 var methods = [
 /**
- * Determines whether each node has the given className.
+ * Determines whether the node has the given className.
  * @method hasClass
  * @for Node
  * @param {String} className the class name to search for
- * @return {Boolean} Whether or not the element has the specified class
+ * @return {Boolean} Whether or not the node has the specified class
  */
  'hasClass',
 
 /**
- * Adds a class name to each node.
+ * Adds a class name to the node.
  * @method addClass
  * @param {String} className the class name to add to the node's class attribute
  * @chainable
  */
  'addClass',
 
 /**
- * Removes a class name from each node.
+ * Removes a class name from the node.
  * @method removeClass
  * @param {String} className the class name to remove from the node's class attribute
  * @chainable
  */
  'removeClass',
 
 /**
- * Replace a class with another class for each node.
+ * Replace a class with another class on the node.
  * If no oldClassName is present, the newClassName is simply added.
  * @method replaceClass
  * @param {String} oldClassName the class name to be replaced
@@ -63,15 +63,15 @@ Y.Node.importMethod(Y.DOM, methods);
  * Adds a class name to each node.
  * @method addClass
  * @see Node.addClass
- * @param {String} className the class name to add to the node's class attribute
+ * @param {String} className the class name to add to each node's class attribute
  * @chainable
  */
 
 /**
  * Removes a class name from each node.
  * @method removeClass
  * @see Node.removeClass
- * @param {String} className the class name to remove from the node's class attribute
+ * @param {String} className the class name to remove from each node's class attribute
  * @chainable
  */
 
@@ -86,7 +86,7 @@ Y.Node.importMethod(Y.DOM, methods);
  */
 
 /**
- * If the className exists on the node it is removed, if it doesn't exist it is added.
+ * For each node, if the className exists on the node it is removed, if it doesn't exist it is added.
  * @method toggleClass
  * @see Node.toggleClass
  * @param {String} className the class name to be toggled