[css-2020] linkfix

Author: svgeesus

css-2020/Overview.bs

@@ -173,8 +173,8 @@ Classification of CSS Specifications</h2>
 		<dd>
 			Replaces CSS2&sect;7.3 and expands on the syntax for media-specific styles.
 
-		<dt><a href="https://www.w3.org/TR/css-conditional-1/">CSS Conditional Rules Level 3</a>
-		  [[!CSS-CONDITIONAL-1]]
+		<dt><a href="https://www.w3.org/TR/css-conditional-3/">CSS Conditional Rules Level 3</a>
+		  [[!CSS-CONDITIONAL-3]]
 		<dd>
 			Extends and supersedes CSS2&sect;7.2,
 			updating the definition of ''@media'' rules to allow nesting