Change documentation to reflect the removal of the slave checkpoint flag.
Change documentation to reflect the removal of the slave checkpoint flag.

Review: https://reviews.apache.org/r/31300

Aman-Jain-14/customizedMesos,gsantovena/mesos,gsantovena/mesos,Aman-Jain-14/customizedMesos,neilconway/mesos,Gilbert88/mesos,kaysoky/mesos,gsantovena/mesos,craimbert/mesos,abudnik/mesos,kaysoky/mesos,asamerh4/mesos,dforsyth/mesos,dforsyth/mesos,jpeach/mesos,neilconway/mesos,jpeach/mesos,yuquanshan/customizedMesos,craimbert/mesos,chhsia0/mesos,dforsyth/mesos,chhsia0/mesos,chhsia0/mesos,Aman-Jain-14/customizedMesos,reneploetz/mesos,Aman-Jain-14/customizedMesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,kaysoky/mesos,jpeach/mesos,zmalik/mesos,jpeach/mesos,andschwa/mesos,andschwa/mesos,reneploetz/mesos,asamerh4/mesos,verizonlabs/mesos,kaysoky/mesos,yuquanshan/customizedMesos,zmalik/mesos,Gilbert88/mesos,abudnik/mesos,verizonlabs/mesos,kaysoky/mesos,reneploetz/mesos,andschwa/mesos,reneploetz/mesos,andschwa/mesos,gsantovena/mesos,craimbert/mesos,zmalik/mesos,verizonlabs/mesos,kaysoky/mesos,jpeach/mesos,asamerh4/mesos,craimbert/mesos,dforsyth/mesos,yuquanshan/customizedMesos,verizonlabs/mesos,abudnik/mesos,dforsyth/mesos,zmalik/mesos,zmalik/mesos,chhsia0/mesos,abudnik/mesos,verizonlabs/mesos,craimbert/mesos,neilconway/mesos,gsantovena/mesos,yuquanshan/customizedMesos,jpeach/mesos,chhsia0/mesos,reneploetz/mesos,craimbert/mesos,gsantovena/mesos,andschwa/mesos,asamerh4/mesos,yuquanshan/customizedMesos,reneploetz/mesos,abudnik/mesos,andschwa/mesos,neilconway/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,Gilbert88/mesos,neilconway/mesos,neilconway/mesos,gsantovena/mesos,Gilbert88/mesos,neilconway/mesos,yuquanshan/customizedMesos,chhsia0/mesos,dforsyth/mesos,jpeach/mesos,zmalik/mesos,Aman-Jain-14/customizedMesos,zmalik/mesos,asamerh4/mesos,chhsia0/mesos,craimbert/mesos,kaysoky/mesos,verizonlabs/mesos,Gilbert88/mesos,abudnik/mesos,asamerh4/mesos,asamerh4/mesos,andschwa/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,dforsyth/mesos,verizonlabs/mesos