[css-round-display] Fix typo

Author: bangseongbeom

css-round-display-1/Overview.bs

@@ -249,8 +249,7 @@ Values have the following meanings:
     <dt><dfn>contain</dfn></dt>
     <dd>
         The initial layout viewport and the visual viewport are set to the largest rectangle 
-		which is inscribed in the display of th
-        e device.
+		which is inscribed in the display of the device.
 		What the UA paints outside of the viewport is undefined. 
 		It may be the background color of the canvas, or anything else that
 		the UA deems appropriate.