[selectors-4] Remove cp error. Fixes w3c#123.

Author: tabatkins

selectors/Overview.bs

@@ -1065,13 +1065,6 @@ The Matches-any Pseudo-class: '':matches()''</h3>
 	unless that compound selector contains
 	an explicit <a>universal selector</a> or <a>type selector</a>.
 
-	As with '':matches()'',
-	default namespace declarations do not affect the <a>compound selector</a>
-	representing the <a>subject</a> of any selector
-	within a '':matches()'' pseudo-class,
-	unless that compound selector contains
-	an explicit <a>universal selector</a> or <a>type selector</a>.
-
 	<div class="example">
 		For example, the following selector matches any element that is being
 		hovered or focused, regardless of its namespace. In particular, it