Release V2.1.0 (#64)

* Automated commit message

* Update CHANGELOG.md

---------

Co-authored-by: PayPalServerSDKs <server-sdks@paypal.com>

doc/models/order-tracker-request.md

@@ -25,7 +25,7 @@ The tracking details of an order.
   "capture_id": "capture_id0",
   "notify_payer": false,
   "tracking_number": "tracking_number6",
-  "carrier": "ZELERIS",
+  "carrier": "ACS_GR",
   "carrier_name_other": "carrier_name_other0",
   "items": [
     {

doc/models/shipment-carrier.md

@@ -1423,4 +1423,5 @@ The carrier for the shipment. Some carriers have a global version as well as loc
 | `SWIFTX` | Swiftx. |
 | `SFYDEXPRESS` | Sfyd Express. |
 | `TOPTRANS` | Toptrans. |
+| `OTHER` | Other. |