Minor cleanup in upgrades.md.
Minor cleanup in upgrades.md.

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