Correct the equivalent :submit selector, close jquerygh-292.

Technically the equivalent CSS-standard selector for :submit is more complex if
you want to handle the case of buttons with no type attribute, but the text
makes it clear this is a bad idea. You could always use a .filter() instead.

Author: dmethvin

entries/submit-selector.xml

@@ -7,9 +7,9 @@
   </signature>
   <desc>Selects all elements of type submit.</desc>
   <longdesc>
-    <p>The <code>:submit</code> selector typically applies to button or input elements. Note that some browsers treat <code>&lt;button&gt;</code> element as <code>type="default"</code> implicitly while others (such as Internet Explorer) do not.  </p>
+    <p>The <code>:submit</code> selector typically applies to button or input elements. Note that some browsers treat <code>&lt;button&gt;</code> element as <code>type="submit"</code> implicitly while others (such as Internet Explorer) do not. To ensure that markup works consistently across all browsers and guarantee that it is possible to consistently select buttons that will submit a form, always specify a <code>type</code> property.</p>
   </longdesc>
-  <note id="jquery-selector-extension-alt" type="additional" data-selector=":submit" data-alt="[type=&quot;submit&quot;]"/>
+  <note id="jquery-selector-extension-alt" type="additional" data-selector=":submit" data-alt="input[type=&quot;submit&quot;], button[type=&quot;submit&quot;]"/>
   <example>
     <desc>Finds all submit elements that are descendants of a td element.</desc>
     <code><![CDATA[