Updated API from documentation release

Author: ct-sdks[bot]

api-specs/api/types/cart/CartDraft.raml

@@ -27,8 +27,8 @@ properties:
     description: |
       [ResourceIdentifier](ctp:api:type:ResourceIdentifier) to the Customer Group of the Customer that the Cart belongs to. Used for [Line Item price selection](/../api/pricing-and-discounts-overview#line-item-price-selection).
 
-      It is automatically set if the Customer referenced in `customerId` belongs to a Customer Group.
-      It can also be set explicitly when no `customerId` is present.
+      You can set either a `customerId` or a `customerGroup`.
+      If the Customer referenced in `customerId` belongs to a Customer Group then `customerGroup` is set automatically.
   anonymousId?:
     type: string
     description: |