AuthorizationPolicy docs falsely imply that namespace can be set for spec.targetRef

[netthier]

The docs at https://linkerd.io/2-edge/reference/authorization-policy/#authorizationpolicy currently claim the following:

An AuthorizationPolicy spec may contain the following top level fields:

• targetRef: A TargetRef which references a resource to which the authorization policy applies
• requiredAuthenticationRefs: A list of TargetRefs representing the required authentications. In the case of multiple entries, all authentications must match.

The docs for TargetRef here: https://linkerd.io/2-edge/reference/authorization-policy/#targetref then claim that it has a field called namespace:

namespace: The namespace of the target resource. When unspecified (or empty string), this refers to the local namespace of the policy.

This seems to imply that it's possible to set .spec.targetRef.namespace for AuthorizationPolicies. However, it is not, and the CRD only contains the namespace field for requiredAuthenticationRefs.
I'm not sure if this is a bug in the Linkerd CRDs or the docs, but this is a contradiction.