Update tags.html

docs/_includes/examples/tags.html

@@ -3,13 +3,14 @@
 
   <p>
     Select2 can be used to quickly set up fields used for tagging. 
-    <code>multiple</code> have to be enabled on the field for tags support.
   </p>
 
   <p>
     Note that when tagging is enabled the user can select from pre-existing
     options or create a new tag by picking the first choice, which is what
     the user has typed into the search box so far.
+    To enable a multiple tags select, don't forget the <code>multiple</code>
+    attribute.
   </p>
 
   <div class="s2-example">