[BUG] More info needed in ZHA Cube write-up about switching modes...

[SirGoodenough]

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See this post and add note about attribute updated into instructions.
https://community.home-assistant.io/t/zha-xiaomi-cube-controller/495975/69?u=sir_goodenough

Issue based on question from
https://community.home-assistant.io/t/zha-xiaomi-cube-controller/495975/68?u=sir_goodenough