docs: extend: authorization.md: add a note about confidential stuff in Err
docs: extend: authorization.md: add a note about confidential stuff in Err

Signed-off-by: Antonio Murdaca <f9809039ea4850e75dcb8d80b778844aa463358f@redhat.com>

ashfall/cli,riyazdf/cli,ashfall/cli,dnephin/cli,thaJeztah/cli,cpuguy83/cli,redpanda/cli,allencloud/cli,riyazdf/cli,cpuguy83/cli,docker/cli,Zebrilee/cli,allencloud/cli,e11137/cli,dnephin/cli,docker/cli,Zebrilee/cli,thaJeztah/cli,redpanda/cli,e11137/cli