ajax: Specified behavior for a timeout of 0

Fixes gh-979
Closes gh-1006

Author: AurelioDeRosa

entries/jQuery.ajax.xml

@@ -170,7 +170,7 @@ $.ajax({
         <desc>A function to be called if the request succeeds. The function gets passed three arguments: The data returned from the server, formatted according to the <code>dataType</code> parameter or the <code>dataFilter</code> callback function, if specified; a string describing the status; and the <code>jqXHR</code> (in jQuery 1.4.x, XMLHttpRequest) object. <strong>As of jQuery 1.5</strong>, <em>the success setting can accept an array of functions. Each function will be called in turn.</em> This is an <a href="/Ajax_Events/">Ajax Event</a>.</desc>
       </property>
       <property name="timeout" type="Number">
-        <desc>Set a timeout (in milliseconds) for the request. This will override any global timeout set with <a href="/jQuery.ajaxSetup/">$.ajaxSetup()</a>. The timeout period starts at the point the <code>$.ajax</code> call is made; if several other requests are in progress and the browser has no connections available, it is possible for a request to time out before it can be sent. <strong>In jQuery 1.4.x and below,</strong> the XMLHttpRequest object will be in an invalid state if the request times out; accessing any object members may throw an exception. <strong>In Firefox 3.0+ only,</strong> script and JSONP requests cannot be cancelled by a timeout; the script will run even if it arrives after the timeout period.</desc>
+        <desc>Set a timeout (in milliseconds) for the request. A value of 0 means there will be no timeout. This will override any global timeout set with <a href="/jQuery.ajaxSetup/">$.ajaxSetup()</a>. The timeout period starts at the point the <code>$.ajax</code> call is made; if several other requests are in progress and the browser has no connections available, it is possible for a request to time out before it can be sent. <strong>In jQuery 1.4.x and below,</strong> the XMLHttpRequest object will be in an invalid state if the request times out; accessing any object members may throw an exception. <strong>In Firefox 3.0+ only,</strong> script and JSONP requests cannot be cancelled by a timeout; the script will run even if it arrives after the timeout period.</desc>
       </property>
       <property name="traditional" type="Boolean">
         <desc>Set this to <code>true</code> if you wish to use the traditional style of <a href="/jQuery.param/">param serialization</a>.</desc>