[css-images-4][editorial] Work around generation of invalid markup

Author: svgeesus

css-images-4/Overview.bs

@@ -1607,7 +1607,7 @@ Conic Gradients: the ''conic-gradient()'' notation</h3>
 		Would a radius (inner & outer) for clipping the gradient be useful? If so, we could also support lengths in color stop positions, since we now have a specific radius.
 
 	<p class='issue'>
-		Are elliptical conic gradients useful? Do graphics libraries support them?
+		Are elliptical conic gradients useful? Do graphics libraries support them?</p>
 
 	<wpt>
 		gradient/conic-gradient-001.html