[css-position-3] Refactor list.

Author: fantasai

css-position-3/Overview.bs

@@ -424,13 +424,13 @@ Positioning Coordinates</h2>
 	the [=flow-relative=] [=inset properties=] 'inset-block-start', 'inset-inline-start', 'inset-block-end', and 'inset-inline-end';
 	and their [=shorthands=], 'inset-block', 'inset-inline', and 'inset'.
 
-	The interpretation of these specified coordinates varies by [=positioning scheme=]:
+	The interpretation of these [=inset properties=] varies by [=positioning scheme=]:
 
-	* for [=absolute positioning=], the [=inset properties=] represent
+	* for [=absolute positioning=], they represent
 		insets from the containing block.
-	* for [=relative positioning=], the [=inset properties=] represent
+	* for [=relative positioning=], they represent
 		insets from the box’s original margin edge.
-	* for [=sticky positioning=], the [=inset properties=] represent
+	* for [=sticky positioning=], they represent
 		insets from the [=scrollport=] edge.
 
 <h3 id="insets">