Add .unbind() no-arguments signature

Author: antishok

entries/unbind.xml

@@ -4,7 +4,7 @@
   <desc>Remove a previously-attached event handler from the elements.</desc>
   <signature>
     <added>1.0</added>
-    <argument name="eventType" type="String" optional="true">
+    <argument name="eventType" type="String">
       <desc>A string containing a JavaScript event type, such as <code>click</code> or <code>submit</code>.</desc>
     </argument>
     <argument name="handler(eventObject)" type="Function" optional="true">
@@ -26,6 +26,9 @@
       <desc>A JavaScript event object as passed to an event handler.</desc>
     </argument>
   </signature>
+  <signature>
+    <added>1.0</added>
+  </signature>
   <longdesc>
     <p>Event handlers attached with <code>.bind()</code> can be removed with <code>.unbind()</code>. (As of jQuery 1.7, the <a href="/on/"><code>.on()</code></a> and <a href="/off/"><code>.off()</code></a> methods are preferred to attach and remove event handlers on elements.) In the simplest case, with no arguments, <code>.unbind()</code> removes all handlers attached to the elements:</p>
     <pre><code>