Discourage usage of <a>s for disabled pagination items

Refs twbs@a217db1#commitcomment-18275320
/fyi @patrickhlauke

[skip sauce]

Author: cvrebert

docs/_includes/components/pagination.html

@@ -77,7 +77,7 @@ <h3>Disabled and active states</h3>
   </ul>
 </nav>
 {% endhighlight %}
-  <p>You can optionally swap out active or disabled anchors for <code>&lt;span&gt;</code>, or omit the anchor in the case of the previous/next arrows, to remove click functionality while retaining intended styles.</p>
+  <p>We recommend that you swap out active or disabled anchors for <code>&lt;span&gt;</code>, or omit the anchor in the case of the previous/next arrows, to remove click functionality while retaining intended styles.</p>
 {% highlight html %}
 <nav aria-label="...">
   <ul class="pagination">