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The multimaster package that you link to is a ROS package that was last released many years ago and hasn't been supported for several distros.
If you're looking for multi master capabilities I'd recommend checking out multimaster_fkie or rocon_multimaster
The Master-Slave API you link to is the internal APIs that ROS uses under the hood to coordinate between nodes. There are not tutorials for it as it's not considered a user facing API and you're generally not recommended to interact with it directly.