Horde.DynamicSupervisor.terminate_child

You're seeing just the function terminate_child, go back to Horde.DynamicSupervisor module for more information.
Link to this function

terminate_child(supervisor, child_pid)

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Specs

terminate_child(Supervisor.supervisor(), child_pid :: pid()) ::
  :ok
  | {:error, :not_found}
  | {:error, {:node_dead_or_shutting_down, String.t()}}

Terminate a child process.

Works like DynamicSupervisor.terminate_child/2.