Tabs: Added note about restrictions on changing ajaxSettings inside beforeLoad events. Fixes jquery#93.

Author: scottgonzalez

entries/tabs.xml

@@ -115,8 +115,10 @@
 			</argument>
 		</event>
 		<event name="beforeLoad">
-			<desc>Triggered when a remote tab is about to be loaded, after the <a href="#event-beforeActivate"><code>beforeActivate</code></a> event. Can be canceled to prevent the tab panel from loading content; though the panel will still be activated. This event is triggered just before the Ajax request is made, so modifications can be made to <code>ui.jqXHR</code> and <code>ui.ajaxSettings</code>.</desc>
-			<argument name="event" type="Event"/>
+			<desc>
+				<p>Triggered when a remote tab is about to be loaded, after the <a href="#event-beforeActivate"><code>beforeActivate</code></a> event. Can be canceled to prevent the tab panel from loading content; though the panel will still be activated. This event is triggered just before the Ajax request is made, so modifications can be made to <code>ui.jqXHR</code> and <code>ui.ajaxSettings</code>.</p>
+				<p><em>Note: Although <code>ui.ajaxSettings</code> is provided and can be modified, some of these settings have already been processed by jQuery. For example, <a href="http://api.jquery.com/jQuery.ajaxPrefilter/">prefilters</a> have been applied, <code>data</code> has been processed, and <code>type</code> has been determined. The <code>beforeLoad</code> event occurs at the same time, and therefore has the same restrictions, as the <code>beforeSend</code> callback from <a href="http://api.jquery.com/jQuery.ajax/"><code>jQuery.ajax()</code></a>.</em></p>
+			</desc>
 			<argument name="ui" type="Object">
 				<property name="tab" type="jQuery">
 					<desc>The tab that is being loaded.</desc>