[css-display] bikeshed error fix

Author: fantasai

css-display/Overview.bs

@@ -14,7 +14,7 @@ Previous Version: http://www.w3.org/TR/2014/WD-css-display-3-20140911/
 Editor: Tab Atkins Jr., Google, http://xanthir.com/contact/
 Editor: Elika J. Etemad / fantasai, Invited Expert, http://fantasai.inkedblade.net/contact
 Abstract: This module describes how the CSS formatting box tree is generated from the document element tree and defines the 'display' and 'box-suppress' properties that control it.
-Ignored Terms: display-model, display-role, table row group box
+Ignored Terms: display-model, display-role, table row group box, absolutely positioned
 </pre>
 <pre class="link-defaults">
 spec:css-break-3; type:dfn; text:fragment;