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fix Attenuator topic in README #8

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@ -146,15 +146,15 @@ publish-mqtt Urukul/Control/Channel0/Switch "on"
```
This turns on the channel 0 RF switch.
## Attenuator
- Topic: `Urukul/Control/Channel<ch_num>/Attenuator`
## Attenuation
- Topic: `Urukul/Control/Channel<ch_num>/Attenuation`
- ch_num: The channel number, from 0 to 3.
- Message: `<atten> [dB]`
- atten: Attenuation of the attenuator of the specified channel. The unit dB is optional. Valid attenuation is within [0, 31.5] (inclusive) in decibel.
### Example
```shell
publish-mqtt Urukul/Control/Channel0/Attenuator "20 dB"
publish-mqtt Urukul/Control/Channel0/Attenuation "20 dB"
```
This sets the attenuation of the channel 0 attenuator to be 20 dB.