Config Reference: Add max_rad_velocity to polar kinematics

Adds max_rad_velocity for reducing rotational velocity as variable to config reference

Signed-off-by: Nils Hensch nils.hensch@gmx.de

docs/Config_Reference.md

@@ -531,6 +531,11 @@ max_z_velocity:
 max_z_accel:
 #   This sets the maximum acceleration (in mm/s^2) of movement along
 #   the z axis. The default is to use max_accel for max_z_accel.
+max_rad_velocity:
+#   This limits the maximum rotational velocity (in rad/s) of a move.
+#   Lower values will result in longer print times, but prevents too
+#   fast motions near the center. A value of 0 deactivates the 
+#   scaling. The default is 0.
 
 # The stepper_x section is used to describe the X axis as well as the
 # stepper controlling the X-Z movement.