config: Update example configs to use rotation_distance

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

config/printer-tronxy-x8-2018.cfg

@@ -19,7 +19,8 @@ serial: /dev/ttyUSB0
 step_pin: PD7
 dir_pin: PC5
 enable_pin: !PD6
-step_distance: 0.010
+microsteps: 16
+rotation_distance: 32
 endstop_pin: ^!PC2
 position_endstop: -47
 position_max: 220
@@ -30,7 +31,8 @@ homing_speed: 50
 step_pin: PC6
 dir_pin: PC7
 enable_pin: !PD6
-step_distance: 0.010
+microsteps: 16
+rotation_distance: 32
 endstop_pin: ^!PC3
 position_endstop: 0
 position_max: 220
@@ -41,7 +43,8 @@ homing_speed: 50
 step_pin: PB3
 dir_pin: !PB2
 enable_pin: !PD6
-step_distance: 0.0025
+microsteps: 16
+rotation_distance: 8
 endstop_pin: ^!PC4
 position_endstop: 0
 position_max: 210
@@ -51,7 +54,8 @@ homing_speed: 10
 step_pin: PB1
 dir_pin: PB0
 enable_pin: !PD6
-step_distance: 0.009931
+microsteps: 16
+rotation_distance: 31.779
 nozzle_diameter: 0.400
 filament_diameter: 1.750
 heater_pin: PD5