setTxPower() suggested documentation change nRF51 vs nRF52

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jijidad
The API Ref page currently states:

power - Transmit power. Accepted values are -40, -30, -20, -16, -12, -8, -4, 0, and 4 dBm. Others will give an error code.

But I tried to set my puck's TxPower to -30 and got this:
```
>NRF.setTxPower(-30);
Uncaught Error: Got BLE error 0x7 (INVALID_PARAM)
 at line 1 col 19
NRF.setTxPower(-30);
```
Digging into the code there is a comment indicating-30 is nRF51 only. Might be good to use the same (or similar) line on the API reference page:

Accepted values are -40(nRF52 only), -30(nRF51 only), -20, -16, -12, -8, -4, 0, and 4 dBm. Others will give an error code.

Also, I'm not even sure what is the difference between nRF52 and nRF51? Is nRF52 just newer firmware/hardware?

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