config: Update example configs to use rotation_distance

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

config/generic-gt2560.cfg

@@ -8,7 +8,8 @@
 step_pin: ar25
 dir_pin: ar23
 enable_pin: !ar27
-step_distance: .0125
+microsteps: 16
+rotation_distance: 40
 endstop_pin: ^ar22
 position_endstop: 0
 position_max: 200
@@ -18,7 +19,8 @@ homing_speed: 30
 step_pin: ar31
 dir_pin: ar33
 enable_pin: !ar29
-step_distance: .0125
+microsteps: 16
+rotation_distance: 40
 endstop_pin: ^ar26
 position_endstop: 0
 position_max: 200
@@ -28,7 +30,8 @@ homing_speed: 30
 step_pin: ar37
 dir_pin: !ar39
 enable_pin: !ar35
-step_distance: .0025
+microsteps: 16
+rotation_distance: 8
 endstop_pin: ^ar30
 position_endstop: 0
 position_max: 200
@@ -38,7 +41,8 @@ position_min: 0.0
 step_pin: ar43
 dir_pin: ar45
 enable_pin: !ar41
-step_distance: .0104789
+microsteps: 16
+rotation_distance: 33.500
 nozzle_diameter: 0.4
 filament_diameter: 1.750
 heater_pin: ar2