[selectors] Fix link.

Author: tabatkins

selectors/Overview.html

@@ -2702,7 +2702,7 @@ <h3 id=the-focus-pseudo><span class=secno>8.3. </span> The input focus
    which elements can acquire <a
    href="#focus-pseudo"><code>:focus</code></a>. For example, <a
    href="#HTML5" rel=biblioentry>[HTML5]<!--{{HTML5}}--></a> defines a <a
-   href="http://www.whatwg.org/html/selectors.html#selector-focus">list of
+   href="http://www.whatwg.org/html/selectors.html#selector-active">list of
    activatable elements</a>.
 
   <h3 id=drag-pseudos><span class=secno>8.4. </span> The drag-and-drop

selectors/Overview.src.html

@@ -1811,7 +1811,7 @@ <h3 id="the-focus-pseudo">
 
   <p>There may be document language or implementation specific limits on
   which elements can acquire <code>:focus</code>.
-  For example, [[HTML5]] defines a <a href="http://www.whatwg.org/html/selectors.html#selector-focus">list of activatable elements</a>.
+  For example, [[HTML5]] defines a <a href="http://www.whatwg.org/html/selectors.html#selector-active">list of activatable elements</a>.
 
 <h3 id="drag-pseudos">
 The drag-and-drop pseudo-classes</h3>