[doc] Minor rewrite of some new docs
[doc] Minor rewrite of some new docs

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