Callbacks service docs updated

interface/models/permission_bound.yaml

@@ -1,9 +1,11 @@
 components:
   schemas:
     PermissionBound:
+      description: Association between an organization and a permission, including archival state.
       allOf:
         - $ref: ./storable.yaml#/components/schemas/Storable
         - type: object
+          description: Permission binding details scoped to an organization.
           additionalProperties: false
           required:
             - organizationRef
@@ -11,8 +13,11 @@ components:
             - isArchived
           properties:
             organizationRef:
+              description: Identifier of the organization that owns this permission binding.
               $ref: ./objectid.yaml#/components/schemas/ObjectId
             permissionRef:
+              description: Identifier of the permission granted to the organization.
               $ref: ./objectid.yaml#/components/schemas/ObjectId
             isArchived:
+              description: Indicates whether this object is archived and inactive.
               type: boolean