Update set-up-dns-services-on-cpanel.md

Update 1
Update set-up-dns-services-on-cpanel.md

Update 2
Initial Doc
Fixes metadata
replaces references of CentOS 5 with CentOS 6
Fixes for spelling and syntax.
Merge pull request #1 from alexfornuto/cpanel-update

Cpanel update
remove cpanel-on-centos-6.md
Merge pull request #69 from lxsol/master

Update to "set-up-dns-services-on-cpanel"