[css-text-decor-4] Editorial fix

Author: xfq

css-text-decor-4/Overview.bs

@@ -454,7 +454,7 @@ Emphasis Mark Skip: the 'text-emphasis-skip' property</h3>
 			that are not defined as ''<a>punctuation</a>'' above.
 
 		<dt><dfn>narrow</dfn>
-		<dd>Skip characters where the East_Asian_Width property [[!UAX11]]
+		<dd>Skip characters where the <code>East_Asian_Width</code> property [[!UAX11]]
 			of the Unicode database [[!UAX44]] is not F (Fullwidth) or W (Wide).
 	</dl>