Fix :valid and :invalid link in selectors overview

Author: shvaikalesh

selectors-4/Overview.bs

@@ -358,7 +358,7 @@ Selectors Overview</h2>
 			<tr>
 				<td><code>E:valid</code><br><code>E:invalid</code>
 				<td>a user-input element E that meets, or doesn't, its data validity semantics
-				<td>[[#range-pseudos]]
+				<td>[[#validity-pseudos]]
 				<td>3-UI/4
 			<tr>
 				<td><code>E:in-range</code><br><code>E:out-of-range</code>