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Update Reference.md

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@ -262,6 +262,11 @@ The following methods are supported:
* returns a pointer to the Characteristic itself so that the method can be chained during instantiation
* example: `(new Characteristic::MyCustomChar())->setDescription("Tuner Frequency");`
* `SpanCharacteristic *setUnit(const char *unit)`
* adds or overrides the *unit* for a Characteristic, as described in HAP-R2 Table 6-6
* returns a pointer to the Characteristic itself so that the method can be chained during instantiation
* example: `(new Characteristic::RotationSpeed())->setUnit("percentage");`
## *SpanButton(int pin, uint16_t longTime, uint16_t singleTime, uint16_t doubleTime)*
Creating an instance of this **class** attaches a pushbutton handler to the ESP32 *pin* specified.