Update Extras.md

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@ -121,7 +121,7 @@ Details of each function are as follows:
* `void enableCarrier(uint32_t freq, float duty=0.5)` * `void enableCarrier(uint32_t freq, float duty=0.5)`
* enables the overlay of a "square" carrier wave on the pulse train. In practice this is only used for IR signals (not RF) * enables modulation of the pulse train with a "square" carrier wave. In practice this is only used for IR signals (not RF)
* *freq* - the frequency, in Hz, of the carrier wave. If freq=0, carrier wave is disabled * *freq* - the frequency, in Hz, of the carrier wave. If freq=0, carrier wave is disabled