docs: Update order expiry time Admin Only tag (#6230)

changed the tag from `Yes` to `-`

closes #6185

Author: sameshl

docs/api/api_blueprint.apib

@@ -21882,7 +21882,7 @@ To update or get any attribute of this data layer, you will need admin access. H
 | `app-name`  | Name of the application (Eg. Event Yay!, Open Event) | string | - |
 | `tagline` | Tagline (Eg. Event Management and Ticketing, Home)  | string | - |
 | `secret` | App Secret  | string | **yes** |
-| `order-expiry-time`  | Expiry time for orders in minutes | Integer(default: 15) | **yes** |
+| `order-expiry-time`  | Expiry time for orders in minutes | Integer(default: 15) | - |
 | `is-paypal-activated` | Whether paypal payment is configured or not | boolean | - |
 | `is-stripe-activated` | Whether stripe payment is configured or not | boolean | - |
 | `is-omise-activated` | Whether omise payment is configured or not | boolean | - |