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Issue description

 Description:  Course text contains a link to a documentation section that does not exist. From section 4.12.2 of the satellite 6.15 documentation, linked here:
https://docs.redhat.com/en/documentation/red_hat_satellite/6.15/html/installing_satellite_server_in_a_connected_network_environment/performing-additional-configuration-on-server_satellite#preparing-a-host-for-external-databases_satellite

There is a procedure listed which includes:
"Use the instructions in Attaching the Satellite Infrastructure Subscription to attach a Satellite subscription to your server." The "Attaching the Satellite Infrastructure Subscription" text has a link that is broken, and is therefore either a missing procedure from the documentation that needs to be fixed, or a process that is now superseded in Satellite 6.15 that needs to be removed from the course. 

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