added missing =back.
updated known working perl and redhat family OSes
noted Fedora and EPEL based RPMs
Revert "added missing =back."

This reverts commit f5d99185002284440947f8eac7b216ac77b4f2e4.
Merge branch 'master' into RedHat
Merge pull request #10 from strobert/RedHat

RedHat doc updates from Steven Roberts