[cssom-view-1] Return position from top level

This step makes more sense as step 11 (just after step 10 where
`position` is declared) than step 10.9, and looks like a typo.

Author: AtkinsSJ

cssom-view-1/Overview.bs

@@ -1511,7 +1511,7 @@ run the following steps:
             <dt>If <var>element edge D</var> is outside <var>scrolling box edge D</var> and <var>element width</var> is less than <var>scrolling box width</var>
             <dd>Align <var>element edge D</var> with <var>scrolling box edge D</var>.
         </dl>
-    1. Return <var>position</var>.
+1. Return <var>position</var>.
 
 </div>