mention that temporary edits in autogenerated pch headers are ok
mention that temporary edits in autogenerated pch headers are ok

Change-Id: Ifafa5c8847dec80a3b80afc5e10044f9c1c8d48a

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