[css-contain] Fix markup

Author: frivoal

css-contain-1/Overview.bs

@@ -60,7 +60,7 @@ Strong Containment: the 'contain' property</h2>
 		Value: none | strict | content | [ size || layout || style || paint ]
 		Initial: none
 		Inherited: no
-		Applies to: See <a href="#contain-applies">below<a/>
+		Applies to: See <a href="#contain-applies">below</a>
 		Computed value: specified keyword(s)
 		Animation type: not animatable
 	</pre>