Motor6 and Extruder config corrections

[AmigaZoid]

Some of the settings in the Klipper config for Voron2 are incorrect.

Here are the lines affected with corrections

Z3 Stepper - Front Right on Motor6

[stepper_z3] step_pin: PA10 dir_pin: !PA14 enable_pin: !PA15

[tmc2209 extruder] uart_pin: PD14