Consider updating the documentation

[jontrossbach]

I used this for a tutorial on OpenShift the other day and am considering including it as a part of a blog series. The documentation is not in sync with this example any longer.

$ oc new-app openshift/ruby:25~https://github.com/sclorg/ruby-ex
error: multiple images or templates matched "openshift/ruby:25"

The argument "openshift/ruby:25" could apply to the following Docker images, OpenShift image streams, or templates:

* Image stream "ruby" (tag "2.7-ubi8") in project "openshift"
  Use --image-stream="openshift/ruby:2.7-ubi8" to specify this image or template

* Image stream "ruby" (tag "latest") in project "openshift"
  Use --image-stream="openshift/ruby:latest" to specify this image or template

* Image stream "ruby" (tag "2.5-ubi7") in project "openshift"
  Use --image-stream="openshift/ruby:2.5-ubi7" to specify this image or template

* Image stream "ruby" (tag "2.6-ubi8") in project "openshift"
  Use --image-stream="openshift/ruby:2.6-ubi8" to specify this image or template

* Image stream "ruby" (tag "2.7-ubi7") in project "openshift"
  Use --image-stream="openshift/ruby:2.7-ubi7" to specify this image or template

To view a full list of matches, use 'oc new-app -S openshift/ruby:25'