[css-text-decor-4][editorial] fix link

Author: fantasai

css-text-decor-4/Overview.bs

@@ -1088,7 +1088,7 @@ Skipping Spaces: the 'text-decoration-skip-spaces' property</h4>
 		<dt><dfn>all</dfn></dt>
 		<dd>
 			Skip all [=spacers=]
-			and all [=word separators=]
+			and all <a spec=css-text>word separators</a>
 			plus any adjacent 'letter-spacing' or 'word-spacing'.
 
 		<dt><dfn>start</dfn></dt>