[css-anchor-position] Remove issue; fragmentation and other box decisions are pushed to L2

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -802,9 +802,6 @@ If the [=target anchor element=] is [=fragmented=],
 the axis-aligned bounding rectangle
 of the fragments' border boxes is used instead.
 
-Issue: Do we need to control which box we're referring to,
-so you can align to padding or content edge?
-
 The positioned element
 is additionally visually shifted
 by its [=snapshotted scroll offset=],