che-code/insiders currently appears in the docs in Example 8.3. A DevWorkspace custom resource in the downstream docs:

https://access.redhat.com/documentation/en-us/red_hat_openshift_dev_spaces/3.5/html-single/user_guide/index#managing-workspaces-with-apis-creating-workspaces

We have to replace it with che-code/latest, as confirmed by Valerii.