* Update helpcontent2 from branch 'master'
  - tdf#122162 Keyboard shortcuts in table not valid
    
    Deleted page source/text/swriter/guide/table_cells.xhp because
    keyboard shortcuts were deleted.
    
    All references to this page removed too.
    
    Change-Id: Iafedfcdaeb93d5ad2824bd9212526a8bbee20922
    Reviewed-on: https://gerrit.libreoffice.org/70614
    Tested-by: Jenkins
Reviewed-by: Heiko Tietze <tietze.heiko@gmail.com>
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>