sal: document oox.ppt log area
sal: document oox.ppt log area

Change-Id: I756cae33f408a1b735358da5a15b0462a19e31d0

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