Description:

This is a Doc issue found at the doc of "deploy Quay on Openshift", at the step "4.1. Set up Red Hat Quay namespaces and secrets->7.Create a serviceaccount for the database", the example is not correct, two problems:
#1: The "\" after system:serviceaccount:quay-enterprise:postgres should be deleted.
#2: The output is not correct.

https://access.redhat.com/documentation/en-us/red_hat_quay/3/html-single/deploy_red_hat_quay_on_openshift/index#set-up-namespaces-secrets

Correct command example:
oc adm policy add-scc-to-user anyuid -z system:serviceaccount:quay-enterprise:postgres
securitycontextconstraints.security.openshift.io/anyuid added to: ["system:serviceaccount:quay-enterprise:system:serviceaccount:quay-enterprise:postgres"]