[css-writing-modes] Remove obsolete example, per gtalbot's suggestion <https://lists.w3.org/Archives/Public/www-style/2015Sep/0180.html>

Author: fantasai

css-writing-modes/Overview.bs

@@ -1283,19 +1283,6 @@ Orienting Text: the 'text-orientation' property</h3>
     <p class="caption">'text-orientation' values ('writing-mode' is ''vertical-rl'')</p>
   </div>
 
-  <div class="example">
-    <p>In the following example, the root element of a horizontal-only document
-      is set to use ''sideways''. In the rest of the document, the author
-      can just set 'writing-mode' without worrying about whether the text is
-      ''vertical-rl'' or ''vertical-lr''.
-    <pre>
-      :root { text-orientation: sideways; }
-      caption { caption-side: left; writing-mode: vertical-lr; }
-      thead th { writing-mode: vertical-lr; }
-      h1.banner { position: absolute; top: 0; right: 0; writing-mode: vertical-rl; }
-    </pre>
-  </div>
-
   <p class="note">Changing the value of this property may affect inline-level alignment.
     Refer to <a href="#text-baselines">Text Baselines</a> for more details.</p>