[css3-ui] remove border attribute from table per TR publishing feedback.

Author: tantek

css-ui/Overview.bs

@@ -709,7 +709,7 @@ sample CSS for a div:
 }</code></pre>
 
 sample HTML fragments, renderings, and your browser:
-<table border="1" style="color:#000;background:#fff" id="awesome-table"><tbody>
+<table style="color:#000;background:#fff" id="awesome-table"><tbody>
 <tr><th>HTML</th><th>sample rendering</th><th>your browser</th></tr>
 <tr>
 <td><pre><code class="lang-markup">&lt;div&gt;