add some comments to include/tools/ref.hxx
add some comments to include/tools/ref.hxx

Change-Id: Ic38d7f5f816f2a91bfb468c0b7fb241b084a0c44

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