Update List all gift cards endpoint description

VTEX - Giftcard Provider Protocol.json

@@ -25,7 +25,7 @@
                     "Gift Cards"
                 ],
                 "summary": "List all gift cards",
-                "description": "Returns a list of all gift cards available from a gift card provider for a specific customer's cart.\r\n\r\n> ℹ️ This request is made from VTEX to the gift card payment provider.\r\n\r\n## Permissions\r\n\r\nCheck with your service provider to know what permissions are needed.",
+                "description": " Returns a list of all gift cards available from a gift card provider for a specific customer's cart.\r\n\r\nFor scenarios in which there is a gift card with no balance associated with the customer, the payment provider must choose one of the options below to display the information in the response body and implement it on the endpoint:\n\r\n\r1. **Response body returns the complete gift card data mentioning the balance field equal to 0** (`\"balance\": 0`):  In this option, whenever the customer has associated a gift card without a balance, they will need to log in to the store to access the balance information.\n\r2. **The response body only returns an empty array** (`[]`): The customer does not need to log in to the store to access balance information when they have a gift card with no balance associated with it.\n\r\n\r> ℹ️ This request is made from VTEX to the gift card payment provider.\r\n\r\n## Permissions\r\n\r\nCheck with your service provider to know what permissions are needed.",
                 "operationId": "ListAllGiftCards",
                 "parameters": [
                     {