Page: Document that data-attribute data-url stores a non-URI-encoded value

Re jquery-archive/jquery-mobile#1383

Author: Gabriel Schulhof

pages/data-attribute.html

@@ -400,8 +400,8 @@ <h2><a href="../page/">Page</a></h2>
 		<td>string - Title used when page is shown</td>
 	</tr>
 	<tr>
-		<th>data-url</th>
-		<td>url - Value for updating the URL, instead of the url used to request the page</td>
+		<th id="page-data-url">data-url</th>
+		<td>url - Value for updating the URL, instead of the url used to request the page. The value of this attribute should not be URI-encoded.</td>
 	</tr>
 </table>
 <p></p>