config: Update example configs to use rotation_distance

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

config/printer-tevo-flash-2018.cfg

@@ -3,7 +3,7 @@
 
 # Note, this config has only been tested on a modified Tevo Flash
 # (using a Bondtech BMG extruder). If using a stock printer it may be
-# necessary to update the extruder step_distance parameter.
+# necessary to update the extruder rotation_distance parameter.
 
 # See docs/Config_Reference.md for a description of parameters.
 
@@ -11,7 +11,8 @@
 step_pin: ar54
 dir_pin: !ar55
 enable_pin: !ar38
-step_distance: .012491
+microsteps: 16
+rotation_distance: 40
 endstop_pin: !ar3
 position_endstop: -13
 position_min: -13
@@ -22,7 +23,8 @@ homing_speed: 50
 step_pin: ar60
 dir_pin: ar61
 enable_pin: !ar56
-step_distance: .012441
+microsteps: 16
+rotation_distance: 40
 endstop_pin: !ar14
 position_endstop: -3
 position_min: -3
@@ -33,7 +35,8 @@ homing_speed: 50
 step_pin: ar46
 dir_pin: ar48
 enable_pin: !ar62
-step_distance: .002520
+microsteps: 16
+rotation_distance: 8
 position_max: 250
 endstop_pin: probe:z_virtual_endstop
 position_min: -2
@@ -42,13 +45,16 @@ position_min: -2
 step_pin: ar36
 dir_pin: ar34
 enable_pin: !ar30
-step_distance: .002520
+microsteps: 16
+rotation_distance: 8
 
 [extruder]
 step_pin: ar26
 dir_pin: ar28
 enable_pin: !ar24
-step_distance: .002401
+microsteps: 16
+gear_ratio: 3:1
+rotation_distance: 23.050
 nozzle_diameter: 0.400
 filament_diameter: 1.750
 heater_pin: ar10