fixed pep257

Author: flynneva

grbl_ros/_command.py

@@ -37,6 +37,7 @@ def startup(self, machine_id, port, baud, acc, maxx, maxy, maxz,
         Args:
         ----
           self (obj): the grbl object
+          machine_id (str): the name of the machine
           port (str): the serial port that connects to the grbl device
           baud (int): the baud rate to use for serial communication with the grbl device
           acc (int): the grbl device axis acceleration (mm/s^2)