Squashed for pull request
Updated documentation to include CentOS installation instructions.
Extraneous line removal, description change

Docker-DCO-1.1-Signed-off-by: Jim Perrin <jperrin@centos.org> (github: jimperrin)
Correct appearance of shell output

Docker-DCO-1.1-Signed-off-by: Jim Perrin <jperrin@centos.org> (github: jimperrin)
Update documentation per suggestions from ostezer

Docker-DCO-1.1-Signed-off-by: Jim Perrin <jperrin@centos.org> (github: jimperrin)
Merge pull request #6005 from jimperrin/master

Updated documentation to include CentOS installation instructions.