Bug 28271: Adjust API spec

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

api/v1/swagger/paths/return_claims.json

@@ -286,6 +286,10 @@
               "resolved_by": {
                 "description": "User id for the librarian resolving the claim",
                 "type": "string"
+              },
+              "new_lost_status": {
+                "description": "New lost status to set to the item",
+                "type": "string"
               }
             },
             "additionalProperties": false