The spacing margin side identifiers 's' and 'e' may be intuitive for …

Created by: gitsome

For many the abbreviation of "s" and "e" are obvious, but explicitly helping users associate the abbreviations to 'start' and 'end' should help people migrate from version 4 with less friction and appreciate the subtleties associated with Right To Left and Left To Right layouts.

closes #33520 (closed)