update doc to be ceph-fuse task (instead of cfuse)
update doc to be ceph-fuse task (instead of cfuse)

ktdreyer/teuthology,caibo2014/teuthology,caibo2014/teuthology,SUSE/teuthology,tchaikov/teuthology,ktdreyer/teuthology,dmick/teuthology,ceph/teuthology,michaelsevilla/teuthology,tchaikov/teuthology,SUSE/teuthology,dmick/teuthology,ivotron/teuthology,SUSE/teuthology,dreamhost/teuthology,dreamhost/teuthology,zhouyuan/teuthology,robbat2/teuthology,ceph/teuthology,robbat2/teuthology,michaelsevilla/teuthology,t-miyamae/teuthology,yghannam/teuthology,zhouyuan/teuthology,t-miyamae/teuthology,dmick/teuthology,ivotron/teuthology,yghannam/teuthology