I've spotted a mistake in the rendered docs, specifically in step 2 of the procedure:

https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#upgrading-crw-2.15-on-openshift

and in step 2 of the other procedure:

https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.0/html-single/administration_guide/index#rolling-the-upgrade-back-to-crw-2.15-on-red-hat-openshift

 
export INSTALLATION_NAMESPACE=openshift-devspaces 1export PRODUCT_ID=red-hat-openshift-devspacesexport PRODUCT_SHORT_ID=devspacesexport PRODUCT_DEPLOYMENT_NAME=devspacesexport PRE_MIGRATION_PRODUCT_OPERATOR_NAMESPACE=openshift-workspaces 2export PRE_MIGRATION_PRODUCT_DEPLOYMENT_NAME=codereadyexport PRE_MIGRATION_PRODUCT_SUBSCRIPTION_NAME=codeready-workspacesexport PRE_MIGRATION_PRODUCT_CHE_CLUSTER_CR_NAME=codeready-workspacesexport PRE_MIGRATION_PRODUCT_OPERATOR_NAME=codeready-operatorexport PRE_MIGRATION_PRODUCT_OLM_PACKAGE=codeready-workspacesexport PRE_MIGRATION_PRODUCT_OLM_CHANNEL=latestexport PRE_MIGRATION_PRODUCT_OLM_CATALOG_SOURCE=redhat-operatorsexport PRE_MIGRATION_PRODUCT_OLM_STARTING_CSV=crwoperator.v2.15.4
1
openshift-workspaces or another project where CodeReady Workspaces was previously installed.

Reviewing the rendered, published docs, it looks like that I fixed the attribute problem only half-way, and there is more fixing to do with callout 1.