The installation instructions for Toolbox are not complete

This is regarding the document: https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.4/html/api_devops/cli-toolbox

The installation steps only mention the following command:

yum install 3scale_toolbox

However, this has some prerequisites which IMO need to be specified also.

1. The package seems to be in the repository rhel-7-server-3scale-amp-2.4-rpms, so this needs to be mentioned (otherwise "No package 3scale_toolbox available." is thrown when trying to run the above command). The best maybe would be to provide instructions on how to enable the repository, e.g.:

subscription-manager repos --enable=rhel-7-server-3scale-amp-2.4-rpms

I believe this requires a valid 3scale subscription, we can point this out also (needs to be verified).

2. The Toolbox depends on rh-ruby23-ruby package, so it needs to be installed also. For this, the software collections repository needs to be enabled (we can link to the corresponding documentation for instructions).