Updated Variant PWM (markdown)

Variant-PWM.md

@@ -1,12 +1,12 @@
 This variant can be used with Pulse Width Modulation RC Receivers.
 It expects 1ms to 2ms pulses at 50Hz from 2 channels.
 
-## Configuration/Parameters
+## :gear: Configuration/Parameters
 CONTROL_PWM_RIGHT is for the right sensor cable and is set by default to limit the noise as this cable is shorter.<br>
 You can use CONTROL_PWM_LEFT instead if you need to use the left sensor cable.<br>
 DEBUG_SERIAL will be automatically enabled on the opposite cable.<br>
 
-## Wiring:
+## :electric_plug: Wiring:
 * Connect your receiver VCC to 3.3v from programming port, 5v from hall sensor cable, or a voltage regulator, ⚠️ Red wire from sensor cable delivers 15v !!!
 * Connect channel 1(steering) of your receiver to blue wire and channel 2(speed) to green wire of the cable selected in config.h
 * Connect the receiver to ground, ⚠️ On some boards, the black wire is 15v !!! Check with a multi-meter to make sure 15V and ground are not swapped
@@ -15,10 +15,10 @@ DEBUG_SERIAL will be automatically enabled on the opposite cable.<br>
 ## Transmitter configuration:
 * Assign desired joystick to channel 1(steering) and channel 2(throttle)
 
-## Calibration:
+## :control_knobs: Calibration:
 Proceed with [calibration](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Input-Calibration) for better control. 
 
-## Troubleshooting:
+## :toolbox: Troubleshooting:
 If the board is [beeping](https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/wiki/Diagnostics)
 * Make sure you are using the sensor cable(left=CONTROL_PWM_lEFT or right=CONTROL_PWM_RIGHT) selected in config.h
 * You might have a defective input, because of a fried resistor or MCU pin (e.g. [issue](https://github.com/EFeru/hoverboard-firmware-hack-FOC/issues/244)), you can configure the firmware to work on the other cable