Fix
Changed category of fetch and prefetch.
Merge pull request #54 from hughlv/feature/fix_1

Changed category of fetch and prefetch.
Fixed inconsistencies of link title.
Merge pull request #56 from hughlv/feature/fix_1

Fixed inconsistencies of link title.
Merge branch 'feature/newdocs' of github.com:icattlecoder/docs.qiniu.com into feature/newdocs
Merge branch 'feature/newdocs' of github.com:BluntBlade/docs.qiniu.com into feature/newdocs