Add safety limit for hot bed power in example configuration

Marlin/example_configurations/makibox/Configuration.h

@@ -220,7 +220,10 @@
 // all forms of bed control obey this (PID, bang-bang, bang-bang with hysteresis)
 // setting this to anything other than 255 enables a form of PWM to the bed just like HEATER_BED_DUTY_CYCLE_DIVIDER did,
 // so you shouldn't use it unless you are OK with PWM on your bed.  (see the comment on enabling PIDTEMPBED)
-#define MAX_BED_POWER 255 // limits duty cycle to bed; 255=full current
+#define MAX_BED_POWER 175 // limits duty cycle to bed; 255=full current
+// This limit is set to 175 by default in the Makibox configuration and it can adjusted
+// to increase the heat up rate. However, if changed, user must be aware of the safety concerns
+// of drawing too much current from the power supply.
 
 #ifdef PIDTEMPBED
 //120v 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)