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Update zha.markdown Zigbee channel recommendation (#21597)

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Co-authored-by: Franck Nijhof <frenck@frenck.nl>
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@ -253,9 +253,13 @@ zha:
channels: [15, 20, 25] # Channel mask
```
This is a good reference for channel selection [Zigbee and Wifi Coexistance](https://support.metageek.com/hc/en-us/articles/203845040-ZigBee-and-WiFi-Coexistence).
This is a good reference for channel selection for [Zigbee and WiFi coexistance](https://support.metageek.com/hc/en-us/articles/203845040-ZigBee-and-WiFi-Coexistence).
Note that the recommendation is, however, not to change the Zigbee channel from default as not all Zigbee devices support all channels. If you have issues with overlapping frequencies, then it will generally be a better idea to change Wi-Fi channels on your Wi-Fi-router or Wi-Fi Access Points.
The Zigbee specification standards divide the 2.4Ghz ISM radio band into 16 Zigbee channels (i.e. distinct radio frequencies for Zigbee). For all Zigbee devices to be able to communicate, they must support the same Zigbee channel (i.e. Zigbee radio frequency) that is set on the Zigbee Coordinator as the channel to use for its Zigbee network. Not all Zigbee devices support all Zigbee channels, it will usually depend on the hardware and firmware age as well as devices power ratings.
The general recommendation is to only use channels 15, 20, or 25 in order to avoid interoperability problems with Zigbee devices that are limited to only being compatible with the ZLL (Zigbee Light Link) channels as well as lessen the chance of Wi-Fi networks interfering too much with the Zigbee network. Note that especially using Zigbee channels 11, 24, 25, or 26 on your Zigbee Coordinator could mean it will probably not be accessible to older devices as those Zigbee channels are commonly only supported by relatively modern Zigbee hardware devices with newer Zigbee firmware.
Regardless, note that the best practice recommendation is, however, not to change the Zigbee channel from default as not all Zigbee devices support all channels. If you have issues with overlapping frequencies, then it will generally be a better idea to just change Wi-Fi channels on your Wi-Fi Router or all your Wi-Fi Access Points instead.
### Modifying the device type