doc: Known issues - Update platforms for CIA-351

Updated affected platforms for CIA-351
on the Known issues page.

Signed-off-by: divya pillai <[email protected]>

Author: divipillai

doc/nrf/releases_and_maturity/known_issues.rst

@@ -3435,7 +3435,7 @@ CIA-351: Connectivity issues with :ref:`lib_azure_iot_hub`
   If a ``device-bound`` message is sent to the device while it is in the LTE Power Saving Mode (PSM), the TCP connection will most likely be terminated by the server.
   Known symptoms of this are frequent reconnections to cloud, messages sent to Azure IoT Hub never arriving, and FOTA images being downloaded twice.
 
-  **Affected platforms:** nRF9160
+  **Affected platforms:** nRF9160, nRF9161, nRF9151, nRF9131
 
   **Workaround:** Avoid using LTE Power Saving Mode (PSM) and extended DRX intervals longer than approximately 30 seconds. This will reduce the risk of the issue occurring, at the cost of increased power consumption.