Minor documentation update
Minor documentation update

sheldonzf/director,meleslilijing/director,webx32/director,webx32/director,vitalsource/director,cpg1111/director,lzhengms/director,mylikes/director,pandoraui/director,kiritoe/director,fadeit/director,flatiron/director,stonegithubs/director,pandoraui/director,GerHobbelt/director,cpg1111/director,andradedev/director,ks3dev/director,mylikes/director,pocketjoso/director,ks3dev/director,kiritoe/director,GerHobbelt/director,meleslilijing/director,stonegithubs/director,fadeit/director,maxogden/director,vitalsource/director,lzhengms/director,sheldonzf/director,tanzhihang/director,pocketjoso/director,tanzhihang/director,andradedev/director