config: Update example configs to use rotation_distance

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/printer-creality-ender3pro-2020.cfg

@@ -20,7 +20,8 @@
 step_pin: PC2
 dir_pin: PB9
 enable_pin: !PC3
-step_distance: .0125
+microsteps: 16
+rotation_distance: 40
 endstop_pin: ^PA5
 position_endstop: 0
 position_max: 235
@@ -30,7 +31,8 @@ homing_speed: 50
 step_pin: PB8
 dir_pin: PB7
 enable_pin: !PC3
-step_distance: .0125
+microsteps: 16
+rotation_distance: 40
 endstop_pin: ^PA6
 position_endstop: 0
 position_max: 235
@@ -40,7 +42,8 @@ homing_speed: 50
 step_pin: PB6
 dir_pin: !PB5
 enable_pin: !PC3
-step_distance: .0025
+microsteps: 16
+rotation_distance: 8
 endstop_pin: ^PA7
 position_endstop: 0.0
 position_max: 250
@@ -50,7 +53,8 @@ max_extrude_only_distance: 100.0
 step_pin: PB4
 dir_pin: PB3
 enable_pin: !PC3
-step_distance: 0.010752
+microsteps: 16
+rotation_distance: 34.406
 nozzle_diameter: 0.400
 filament_diameter: 1.750
 heater_pin: PA1