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Remove invalid ZLL channel recommendation from ZHA docs (#41431)

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@ -297,7 +297,7 @@ MetaGeek Support has a good reference article about channel selection for [Zigbe
The Zigbee specification standards divide the 2.4&nbsp;GHz 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. Channel support usually depends on the age of the hardware and firmware, as well as on the device's power ratings.
The general recommendation is to only use channels 15, 20, or 25 in order to avoid interoperability problems with Zigbee devices. Not only because there is less chance of Wi-Fi networks interfering too much with the Zigbee network on other channels, but also because not all Zigbee devices support all channels. Some devices, for example, are limited to only being compatible with ZLL (Zigbee Light Link) channels. It is therefore especially not recommended to use Zigbee channels 11, 24, 25, or 26 on your Zigbee coordinator. These Zigbee channels are commonly only supported by relatively modern Zigbee hardware devices with newer Zigbee firmware. If using those channels, your coordinator may not be usable with older Zigbee devices.
The general recommendation is to only use channels 15, 20, or 25 in order to avoid interoperability problems with Zigbee devices. Not only because there is less chance of Wi-Fi networks interfering too much with the Zigbee network on other channels, but also because not all Zigbee devices support all channels.
#### Modifying the device type