[css-position-3][editorial] Fix markup

Author: fantasai

css-position-3/Overview.bs

@@ -1323,7 +1323,7 @@ The Height Of Absolutely Positioned, Replaced Elements</h3>
 	and the element has an intrinsic ratio
 	then the used value of 'height' is:
 
-	<code>(used width) / (intrinsic ratio)</code></p>
+	<code>(used width) / (intrinsic ratio)</code>
 
 	Otherwise, if 'height' has a computed value of ''top/auto''
 	and the element has an intrinsic height,