Update vector-labels example

Add note about the 'Text/Wrap' option currently not working.

examples/vector-labels.html

@@ -301,6 +301,7 @@
           <p id="shortdesc">Example of GeoJSON features with labels.</p>
           <div id="docs">
             <p>See the <a href="vector-labels.js" target="_blank">vector-labels.js source</a> to see how this is done.</p>
+            <p><strong>Note:</strong> The 'Text/Wrap' option is currently not working properly.  It's supposed to add '\n' to allow multiline labels, but spaces are currently shown instead.</p>
           </div>
           <div id="tags">geojson, vector, openstreetmap, label</div>
         </div>