Update Stepper_UNIPOLAR.md

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@ -4,7 +4,9 @@ This class provides a generic driver for use with any center-tapped unipolar ste
The **Stepper_UNIPOLAR** class includes the following constructors: The **Stepper_UNIPOLAR** class includes the following constructors:
* `Stepper_UNIPOLAR(int coil1A, int coil1B, int coil2A, int coil2B)` * `Stepper_UNIPOLAR(int coil1A, int coil1B, int coil2A, int coil2B)`
* controls the driver board using only 4 digital pins from the ESP32, where the parameters specify the pin numbers. Supports the following step type modes: * controls the driver board using 4 digital pins from the ESP32, where the parameters specify the pin numbers
* the driver circuit should be connected and configured such that when any of ESP32 pins specified above are set to are HIGH, current flows through the corresponding coil/phase. Similarly, when a pin is set LOW, the driver circuit should stop the flow of current through the corresponding coil/phase.
* supported modes are as follows:
* FULL_STEP_ONE_PHASE * FULL_STEP_ONE_PHASE
* FULL_STEP_TWO_PHASE * FULL_STEP_TWO_PHASE