tdf#54346 remove confusing description for function WEEKDAY
tdf#54346 remove confusing description for function WEEKDAY

The output range mentioned in the function wizard is not always
1-7, but dependent of the value of argument Mode.
The output range for each possible value of argument Mode is
clearly described in the regular help for Calc.

Change-Id: I23eae9be6f8f38319496aaf4a1b7f2349e2be3eb
Reviewed-on: https://gerrit.libreoffice.org/15852
Reviewed-by: Joren De Cuyper <519f2bc933af8d0645d9edfabfb3d6bbc4716bd1@libreoffice.org>
Tested-by: Joren De Cuyper <519f2bc933af8d0645d9edfabfb3d6bbc4716bd1@libreoffice.org>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core