You're reading the documentation for an older, but still supported version (1.33.2).
For information on the latest version, please have a look at 1.33.5.

5.5 Robot Operation State

The operation state information of the robot has a total of 15 states as follows, and all states excluding reservation use (Nos. 11 ~ 14) can be checked through the OnMonitoringState callback function or get_robot_state, which is a user call function.