Add 400 to options where missing

Author: jameslinnell

infrastructure/swagger/05_paths.yaml

@@ -323,6 +323,8 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/Empty"
+        "400":
+          description: "400 response"
       x-amazon-apigateway-integration:
         responses:
           default:
@@ -388,6 +390,8 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/Empty"
+        "404":
+          description: "404 response"
       x-amazon-apigateway-integration:
         responses:
           default: