Mention rounding of v and i in documentation

docs/console_config.md

 
 Sets the voltage of the configuration buffer, in millivolts.
 
+Note: values are rounded down to the nearest Power Delivery voltage unit
+(50 mV).
+
 ### set_i
 
 Usage: `set_i current_in_mA`
 
 Sets the current of the configuration buffer, in milliamperes.
 
+Note: values are rounded down to the nearest Power Delivery current unit
+(10 mA).
+
 ### identify
 
 Usage: `identify`