Added missing colon in modules.md.
Added missing colon in modules.md.

Review: https://reviews.apache.org/r/38146/

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