[css-selectors-4] Fix interestefor typo (w3c#12673)

Author: lukewarlow

selectors-4/Overview.bs

@@ -2556,7 +2556,7 @@ The Interest Pseudo-classes: '':interest-source'' and '':interest-target''</h3>
 	the user has to actually indicate interest in it too.
 	Similarly, '':interest-target'' only matches an [=interest target=]
 	that is linked to an element the user is <em>currently</em> interested in,
-	not any element pointed to by an <{html-global/interestefor}> attribute.
+	not any element pointed to by an <{html-global/interestfor}> attribute.
 
 
 <h2 id="time-pseudos">