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Update Reference.md

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@ -33,14 +33,11 @@ Methods with a return type of `Span&` return a reference to `homeSpan` itself an
* sets the ESP32 *pin* to use for the HomeSpan Control Button
* if this method is not called, HomeSpan will assume there is no Control Button
* the optional second argument, *triggerType*, configures the Control Button as follows:
* `PushButton::TRIGGER_ON_LOW`
* triggers when *pin* is driven LOW
* `PushButton::TRIGGER_ON_LOW` - triggers when *pin* is driven LOW
* suitable for buttons that connect *pin* to GROUND (this is the default when *triggerType* is not specified)
* `PushButton::TRIGGER_ON_HIGH`
* triggers when *pin* is driven HIGH
* `PushButton::TRIGGER_ON_HIGH` - triggers when *pin* is driven HIGH
* suitable for buttons that connect *pin* to VCC (typically 3.3V)
* `PushButton::TRIGGER_ON_TOUCH`
* uses the device's touch-sensor peripheral to trigger when a sensor attached to *pin* has been touched
* `PushButton::TRIGGER_ON_TOUCH` - uses the device's touch-sensor peripheral to trigger when *pin* has been touched
* not available on ESP32-C3
* as an alternative, you can set *triggerType* to any user-defined function of the form `boolean(int arg)` to utilize any device as a Control Button. See **SpanButton** below for details