Document URL: 
https://access.redhat.com/documentation/en-us/red_hat_update_infrastructure/4/html/configuring_and_managing_red_hat_update_infrastructure/assembly_cmg-managing-content-delivery-servers#proc_cmg-registering-new-cds_assembly_cmg-managing-content-delivery-servers

Describe the issue: 

It should be ~<cloud-user>/.ssh/id_rsa and not /home/<cloud-user>/.ssh/id_rsa_rhua
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Absolute path to an SSH private key to log into <cds1.example.com> as <cloud-user>: 
/home/<cloud-user>/.ssh/id_rsa_rhua
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Suggestions for improvement: 
Change to ~<cloud-user>/.ssh/id_rsa