mention root group in "random user id" explanation

[carljmosca]

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This issue template is for reporting a problem with content in the OpenShift cookbook. Please provide answers to the following questions.

What is the URL of the page in the OpenShift cookbook which you want to report a problem with?

https://cookbook.openshift.org/users-and-role-based-access-control/why-do-my-applications-run-as-a-random-user-id.html

What is incorrect about the content of that page in the OpenShift cookbook?

Nothing that I have noticed.

What suggestion, if any, do you have for correcting the page in the OpenShift cookbook?

I think the fact that the "random" user can be (is by default?) in the root group is helpful and should be mentioned here. In my opinion, it makes the use of the random user id a bit more flexible.