feat(openthread): support multipan feature for host device

docs/en/api-reference/network/esp_openthread.rst

@@ -23,6 +23,8 @@ Application Examples
 
 - :example:`openthread/ot_sleepy_device/light_sleep` demonstrates Thread Light-sleep function.
 
+- :example:`openthread/ot_zb_multipan` demonstrates running OpenThread and Zigbee side by side on a host, sharing one 802.15.4 RCP via multipan.
+
 API Reference
 -------------
 

docs/zh_CN/api-reference/network/esp_openthread.rst

@@ -23,6 +23,8 @@ Thread
 
 - :example:`openthread/ot_sleepy_device/light_sleep` 演示了 Thread 浅睡眠功能。
 
+- :example:`openthread/ot_zb_multipan` 演示了如何在同一块主机上同时运行 OpenThread 和 Zigbee，并通过 multipan 共用一颗 802.15.4 RCP。
+
 API参考
 -------------