fixup examples of CDate(From|To)Uno(Date|Time|DateTime)

also mark them as non-localizable

Change-Id: I547317d52bf08bcfb0954267e25ce5f2881d1c75
Reviewed-on: https://gerrit.libreoffice.org/6578
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>