updated test document for new Excel functions, fdo#70798

https://bugs.freedesktop.org/attachment.cgi?id=96899

Two function calls currently fail where implementation needs to be
fixed:
- row 45, function name=[ NETWORKDAYS.INTL ], result=18, expected=19
- row 79, function name=[ WORKDAY.INTL ], result=41755 , expected=41754

Change-Id: Ibb58dfa2f8687c7daa2cb7409803cd14b015dc98