[css-values-5][editorial] fix markup

Author: tabatkins

css-values-5/Overview.bs

@@ -1393,7 +1393,7 @@ Conditional Value Selection: the ''if()'' notation</h3>
 				<div class=example>
 					For example, in ''--foo: if(style(--foo: bar): baz);''
 					the ''style()'' query is automatically false,
-					since [=property replacement=] has already established a &bs<<"property", "--foo"&bs>>; [=substitution context=].
+					since [=property replacement=] has already established a &bs<<;"property", "--foo"&bs>>; [=substitution context=].
 				</div>
 
 				If the result of |condition| is false,