corrected typo in example7 of popup

Author: agcolom

resources/popup/example7.html

@@ -41,7 +41,7 @@
 
         <div data-role="popup" id="popupUndismissable" class="ui-content" style="max-width:280px" data-dismissable="false">
 			<a href="#" data-rel="back" data-role="button" data-theme="a" data-icon="delete" data-iconpos="notext" class="ui-btn-left">Close</a>
-			<p>I have the <code>data-dismissable</code> attribute set to <code>false</code>. I'm not closeable be clicking outside of me.</p>
+			<p>I have the <code>data-dismissable</code> attribute set to <code>false</code>. I'm not closeable by clicking outside of me.</p>
 		</div>
 	</div>
 </div>