Selectmenu: Document that open-as-dialog is deprecated as of 1.4.0

Closes gh-237
Fixes gh-236

Author: Gabriel Schulhof

entries/selectmenu.xml

@@ -168,6 +168,7 @@ $(document).on( "mobileinit", function() {
 
 		<p>When it has too many options to show on the device's screen, the framework will automatically create a new dialog-style &quot;page&quot; populated with a standard <a href="listview">listview</a> for the options. This allows us to use the native scrolling included on the device for moving through a long list. The text inside the <code>label</code> is used as the title for this page. Be aware of the page and pagecontainer events that will be fired for this generated page.
 		<iframe src="/resources/select/example10.html" style="width:100%;height:590px;border:0px"></iframe></p>
+		<p class="warning"><strong>Note:</strong> The behavior whereby the custom select menu creates a new page when the list of options is long is deprecated as of jQuery Mobile 1.4.0. Starting with 1.5.0, the custom select menu will fall back to utilizing the select menu's native behavior when the list of options is too long.</p>
 
 		<h3>Disabled options</h3>