Added some 'To-Do' notes regarding the new 'SwExtraRedlineTbl'

These notes are to make sure if logic needs to be added for the
'SwExtraRedlineTbl' in these functions, in addition to the
'SwRedlineTbl' that is already there.

Change-Id: I7778b4e20f5323a925d05a7df0c727f443566662
Reviewed-on: https://gerrit.libreoffice.org/7823
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>