Updated API from documentation release

Author: ct-sdks[bot]

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

@@ -16,6 +16,7 @@ enum:
 
     The quantity cannot be [increased](ctp:api:type:CartChangeLineItemQuantityAction), and it won't be merged when [adding](ctp:api:type:CartAddLineItemAction) the same Line Item to the Cart.
     If the gift is [removed](ctp:api:type:CartRemoveLineItemAction), an entry is added to the `refusedGifts` array and the discount won't be applied to the Cart.
-    The price cannot be changed [externally](ctp:api:type:CartSetLineItemTotalPriceAction).
+
+    The `totalPrice` is always `0` and cannot be changed externally via the [setLineItemTotalPrice](ctp:api:type:CartSetLineItemTotalPriceAction) action.
 
     All other updates, such as the ones related to Custom Fields, can be used.

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

@@ -6,6 +6,7 @@ discriminatorValue: setLineItemTotalPrice
 example: !include ../../../examples/Cart/CartSetLineItemTotalPriceAction.json
 description: |
   Sets the [LineItem](ctp:api:type:LineItem) `totalPrice` and `price`, and changes the `priceMode` to `ExternalTotal` [LineItemPriceMode](ctp:api:type:LineItemPriceMode).
+  Cannot be used on Gift Line Items (see [LineItemMode](ctp:api:type:LineItemMode)).
 properties:
   lineItemId?:
     type: string

api-specs/checkout/api.raml

@@ -83,7 +83,9 @@ traits:
     projectKey:
       type: string
       description: Identifier of your Checkout entity and `key` of your [Project](/../api/projects/project#project).
+  displayName: Project
   /payment-intents:
+    displayName: Payment Intents
     /{paymentId}:
       (annotations.methodName): withPaymentId
       uriParameters:
@@ -92,6 +94,7 @@ traits:
           description: |
             `id` of the [Payment](/../api/projects/payments).
       post:
+        displayName: Manage Payment by ID
         is:
           - secured_by_manage_payments
         body:
@@ -111,7 +114,9 @@ traits:
             body:
               type: ErrorResponse
   /transactions:
+    displayName: Transactions
     post:
+      displayName: Create Transaction
       is:
         - secured_by_manage_transactions
       body:
@@ -141,6 +146,7 @@ traits:
           description: |
             `id` of the [Transaction](/transactions-api#transaction).
       get:
+        displayName: Get Transaction by ID
         is:
           - secured_by_view_transactions
         description: |
@@ -164,6 +170,7 @@ traits:
           description: |
             `key` of the [Transaction](/transactions-api#transaction).
       get:
+        displayName: Get Transaction by key
         is:
           - secured_by_view_transactions
         description: |