Editorial: fix :target cross-reference

Closes #10889.

Author: annevk

source

@@ -74743,7 +74743,7 @@ Demos:
 
    <dt><dfn selector noexport><code data-x="selector-target">:target</code></dfn></dt>
    <dd>
-    <p>For the purposes of the CSS <code data-x="selector-focus">:target</code>
+    <p>For the purposes of the CSS <code data-x="selector-target">:target</code>
     <span>pseudo-class</span>, the <code>Document</code>'s <i>target elements</i> are a list
     containing the <code>Document</code>'s <span>target element</span>, if it is not null, or
     containing no elements, if it is. <ref>SELECTORS</ref></p>