[css-text-decor-4] Fix bikeshed errors.

Author: fantasai

css-text-decor-4/Overview.bs

@@ -83,7 +83,7 @@ Emphasis Mark Skip: the 'text-emphasis-skip' property</h3>
 	<dl for=text-emphasis-skip type=value>
 		<dt><dfn>spaces</dfn>
 		<dd>
-			Skip <a href="#word-separator">Word separators</a> or characters
+			Skip <a href="http://www.w3.org/TR/css-text/#word-separator">Word separators</a> or characters
 			belonging to the Unicode separator category (Z*).
 			(But note that emphasis marks <em>are</em> drawn for a space
 			 that combines with any combining characters.)