[css-values] markup typo

Author: tabatkins

css-values/Overview.bs

@@ -144,9 +144,11 @@ Component value combinators</h3>
 	ordering of the grammar does not matter:
 	components in the same grouping may be interleaved in any order.
 	Thus, the following lines are equivalent:
+
 	<pre>
-<!---->a || b || c
-<!---->b || a || c</pre>
+	a || b || c
+	b || a || c
+	</pre>
 
 <h3 id="component-multipliers">
 Component value multipliers</h3>