.not(): Improve documentation for Function parameter. Closes #518

Author: AurelioDeRosa

entries/not.xml

@@ -13,7 +13,7 @@
   <signature>
     <added>1.4</added>
     <argument name="function" type="Function">
-      <desc>A function used as a test for each element in the set. <code>this</code> is the current DOM element.</desc>
+      <desc>A function used as a test for each element in the set. It accepts two arguments, <code>index</code>, which is the element's index in the jQuery collection, and <code>element</code>, which is the DOM element. Within the function, <code>this</code> refers to the current DOM element.</desc>
       <argument name="index" type="Integer" />
       <argument name="element" type="Element" />
       <return type="Boolean" />