[css-overflow-4] Markup fix

Author: frivoal

css-overflow-4/Overview.bs

@@ -842,7 +842,7 @@ Limiting Visible Lines: the 'line-clamp' shorthand property</h3>
 			and 'block-ellipsis' to ''block-ellipsis/none''.
 
 		<dt><dfn><<integer [1,∞]>></dfn>
-		</dt><dfn><'block-ellipsis'></dfn>
+		<dt><dfn><'block-ellipsis'></dfn>
 		<dd>
 			Sets 'continue' to ''discard''
 			if either or both values ares specified.