Overwrites the optional plain-text note stored on an intake image. This note will be shared to APIUserManagers as an extra piece of information for the intake.
Comments can serve as a one-way channel for APIUsers to communicate to APIUserManagers.

This endpoint is available only to authenticated APIUsers who own the image and whose plan includes the Monitor-or-higher intake comment service. Send an empty string to clear the existing note; the API stores it as null.