Updated API from documentation release

Author: ct-sdks[bot]

api-specs/api/types/cart/updates/CartSetCartTotalTaxAction.raml

@@ -5,13 +5,14 @@ displayName: CartSetCartTotalTaxAction
 discriminatorValue: setCartTotalTax
 example: !include ../../../examples/Cart/CartSetCartTotalTaxAction.json
 description: |
-  Can be used if the Cart has the `ExternalAmount` [TaxMode](ctp:api:type:TaxMode). This update action adds the `taxedPrice` field to the Cart and must be used after any price-affecting change occurs within the Cart.
+  Can be used if the Cart has the `ExternalAmount` [TaxMode](ctp:api:type:TaxMode). This update action adds the `taxedPrice` field to the Cart. It sets the `totalGross` amount, and Composable Commerce calculates the `totalNet` and `totalTax` values based on the provided `externalTotalGross`.
+  You must use this update action after any price-affecting change occurs within the Cart.
 
 properties:
   externalTotalGross:
     type: Money
     description: |
-      The Cart's total gross price becoming the `totalGross` field (`totalNet` + taxes) on the Cart's `taxedPrice`.
+      The total gross amount of the Cart, including tax. This value is used to calculate the `totalNet` and `totalTax` fields of the Cart's `taxedPrice`.
   externalTaxPortions?:
     type: TaxPortionDraft[]
     description: |