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Description of problem:

Some upstream users are complaining that the installer command for enabling REX in Script mode is not easily locatable.

See https://community.theforeman.org/t/remote-execution-does-not-seem-to-be-working-in-foreman-3-6-katello-4-8-or-after-upgrade-to-3-7-4-9/33962/4

I'm guessing it's not documented because it's probably enabled by default with the 'satellite' scenario, but we should still have documentation on how to enable if needed for upstream scenarios.

Hi!
Created PR: https://github.com/theforeman/foreman-documentation/pull/2372

The documentation has been updated: 
https://docs.theforeman.org/3.7/Installing_Proxy/index-katello.html#enabling-remote-execution_smart-proxy
https://docs.theforeman.org/3.6/Installing_Proxy/index-katello.html#enabling-remote-execution_smart-proxy