[css-color-4][editorial] linkfixes

Author: svgeesus

css-color-4/Overview.bs

@@ -28,6 +28,11 @@ WPT Display: open
 
 <pre class="link-defaults">
 spec: css22; type: dfn; text: stacking context
+spec: css22; type:property; text:z-index
+spec: css-cascade-5; type:dfn; text:used value
+spec: css-cascade-5; type:dfn; text:computed value
+spec: css-cascade-5; type:dfn; text:specified value
+spec: css-cascade-5; type:dfn; text:initial value
 spec: css-backgrounds-3; type: property; text: background
 spec: css-backgrounds-3; type: property; text: background-color
 spec: css-backgrounds-3; type: property; text: border-color