[selectors-4] Remove the links to 'live' and 'snapshot' since they don't exist anymore.

Author: tabatkins

selectors-4/Overview.bs

@@ -3993,7 +3993,7 @@ Changes since the 23 August 2012 Working Draft</h3>
 	<ul>
 		<li>Added '':placeholder-shown'' pseudo-classes.
 		<li>Released some restrictions on '':matches()'' and '':not()''.
-		<li>Defined fast and complete Selectors profiles (now called <a>live</a> and <a>snapshot</a>).
+		<li>Defined fast and complete Selectors profiles (now called “live” and “snapshot”).
 		<li>Improved definition of <a>specificity</a> to better handle <a>:matches()</a>.
 		<li>Updated grammar.
 		<li>Cleaned up definition of <<An+B>> notation.