boards: dragino_lsn50: Update outdated link

This commit updates the outdated link to the Dragino LSN50 product
information page.

Note that the link to the wiki is provided in the linked page.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

boards/arm/dragino_lsn50/doc/index.rst

@@ -185,7 +185,7 @@ You can debug an application in the usual way.  Here is an example for the
    :goals: debug
 
 .. _Dragino LSN50 website:
-   http://wiki.dragino.com/index.php?title=Lora_Sensor_Node-LSN50#Resource
+   https://www.dragino.com/products/lora-lorawan-end-node/item/128-lsn50.html
 
 .. _STM32L072CZ on www.st.com:
    http://www.st.com/en/microcontrollers/stm32l072cz.html