[css-text-decor] fill-stroke-3 for fill, stroke (#2834)

css-text-decor-4 refers to fill-stroke-3 (not svg2) for fill and stroke.

Author: ewilligers

css-text-decor-4/Overview.bs

@@ -18,6 +18,9 @@ Ignored Terms: svg shape, svg shapes, invalid, repeatable list, simple list, val
 
 <pre class="link-defaults">
 spec:css-text-3; type:dfn; text:character
+spec:fill-stroke-3; type:property;
+    text: fill
+    text: stroke
 </pre>
 
 <h2 id=intro>Introduction</h2>