As part of documenting source code for easier code reading by newbies,
because of the word "Box" in IDE is used not only for drop-down lists,
but also for other interface elements with limited boundaries

Change-Id: Ie9e1949cc9ac474bffe8201d12b9ce7dc2276076
Reviewed-on: https://gerrit.libreoffice.org/64713
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>