Don't suggest an example with docker commands

docs/operating-eck/air-gapped.asciidoc

@@ -41,15 +41,6 @@ To deploy the ECK operator in an air-gapped environment, you first have to mirro
 
 Once the ECK operator image has been copied, you have to replace the original image name `docker.elastic.co/eck/eck-operator:{eck_version}` with the private name of the image, for example `my-registry/eck/eck-operator:{eck_version}`, in the <<{p}-install-yaml-manifests,operator manifests>>. When using <<{p}-install-helm,Helm charts>>, you have to replace the `image.repository` Helm value with, for example, `my-registry/eck/eck-operator`.
 
-Container registry vendors generally offer native solutions to mirror container images internally. As an alternative, you can use a Docker client which has access to both the public `docker.elastic.co` registry and to the private container registry as follows:
-
-[source,sh]
-----
-docker pull docker.elastic.co/eck/eck-operator:{eck_version}
-docker tag docker.elastic.co/eck/eck-operator:{eck_version} my-registry/eck/eck-operator:{eck_version}
-docker push my-registry/eck/eck-operator:{eck_version}
-----
-
 [float]
 [id="{p}-container-registry-override"]
 == Override the default container registry