toolbox remote management doc not accurate

Following the documentation about managing toolbox remotes, I create a new toolbox remote:

$ docker run registry.redhat.io/3scale-amp2/toolbox-rhel7:3scale2.7 3scale remote add instance_a https://123456789@example_a.net

The command succeeded.

Later when I want to use the remote in another command, the remote does not exist. For instance, if I want to list my remotes

$ docker run registry.redhat.io/3scale-amp2/toolbox-rhel7:3scale2.7 3scale remote list
Empty remote list.

This is a docker issue. Every run of docker command creates a new container and storage (where remotes exist) is gone.

WE could tell customers to create remotes, commit the docker container (create image out of a container) and then run the new image with remote info included.

$ docker run --name toolbox-container registry.redhat.io/3scale-amp2/toolbox-rhel7:3scale2.7 3scale remote add instance_a https://123456789@example_a.net
$ docker commit toolbox-container toolbox
$ docker run toolbox 3scale remote list
instance_a https://example_a.net 123456789

Any other toolbox command, if using remotes, the newly created image should be used, i.e. `toolbox` instead of `registry.redhat.io/3scale-amp2/toolbox-rhel7:3scale2.7`