Update DiskRequest image property

Author: bbiggerr

openapi.yaml

@@ -16156,11 +16156,16 @@ components:
           $ref: '#/components/schemas/Disk/properties/filesystem'
         image:
           type: string
-          description: >
-            An Image ID to deploy the Disk from. Official Linode Images start with
-            `linode/`, while your Images start with `private/`.
+          description: |
+            An Image ID to deploy the Disk from.
+
+            Requires read access to the Image.
 
-            See [/images](/docs/api/images/#images-list) for more information on the Images available for you to use.
+            Access the Images List ([GET /images](/docs/api/images/#images-list))
+            endpoint with authentication to view all available Images. Official Linode Images start with `linode/`,
+            while your account's Images start with `private/`. To give a user permission to use an account Image,
+            access the User's Grant Update
+            ([PUT /account/users/{username}/grants](/docs/api/account/#users-grants-update)) endpoint.
           example: linode/debian9
         authorized_keys:
           type: array