Update README.md (Azure#38726)

* Update README.md

* Update README.md

Author: jerryshia

sdk/communication/azure-communication-sms/README.md

@@ -6,7 +6,7 @@ Read more about Azure Communication Services [here](https://docs.microsoft.com/a
 [Source code](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/communication/azure-communication-sms)
 | [Package (Pypi)](https://pypi.org/project/azure-communication-sms/)
 | [Package (Conda)](https://anaconda.org/microsoft/azure-communication/)
-| [API reference documentation](https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/communication/azure-communication-sms)
+| [API reference documentation](https://learn.microsoft.com/python/api/overview/azure/communication-sms-readme?view=azure-python)
 | [Product documentation](https://docs.microsoft.com/azure/communication-services/quickstarts/telephony-sms/send?pivots=programming-language-python)
 
 ## _Disclaimer_
@@ -152,4 +152,4 @@ For more information see the [Code of Conduct FAQ](https://opensource.microsoft.
 <!-- LINKS -->
 [azure_core]: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/core/azure-core/README.md
 [handle_sms_events]: https://docs.microsoft.com/azure/communication-services/quickstarts/telephony-sms/handle-sms-events
-[next_steps]:https://docs.microsoft.com/azure/communication-services/quickstarts/telephony-sms/send?pivots=programming-language-python
+[next_steps]:https://docs.microsoft.com/azure/communication-services/quickstarts/telephony-sms/send?pivots=programming-language-python