Documentation - WakeOnLan usually only works on the same subnet (#15442)

WakeOnLan packets are sent on Layer 2 and are therefore not routable.
Some Routers may support forwarding the packet to a different subnet (this feature is often called "IP-Helper" and is primarily for DHCP, but may support WoL to).
-> my plan is to add more information on that to the WakeOnLan Component Page
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@ -108,6 +108,10 @@ Common for webOS 3.0 and higher would be to use WakeOnLan feature. To use this f
On newer models (2017+), WakeOnLan may need to be enabled in the TV settings by going to Settings > General > Mobile TV On > Turn On Via WiFi [instructions](https://support.quanticapps.com/hc/en-us/articles/115005985729-How-to-turn-on-my-LG-Smart-TV-using-the-App-WebOS-).
<div class='note'>
This usually only works if the TV is connected to the same network. Routing the WakeOnLan packet to a different subnet requires special configuration on your router or may not be possible.
</div>
```yaml
# Example configuration.yaml entry
wake_on_lan: # enables `wake_on_lan` domain