Update RHEL/CentOS installation instructions #1412
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This updates the RHEL installation instructions to resolve a number of issues. Most importantly, the command didn't work before unless you already had epel-release installed. It has to be installed before yum can see the_silver_searcher, so it needs to be a separate command. Another important detail is that epel-release is only available in the default repositories of CentOS, not RHEL, so installing it by name doesn't work out the box. A better approach is to use the convenience "latest" link provided by the EPEL project. Finally, clarify that this works on both RHEL and CentOS, and for version 6 and up.