suspect confusing wording about PWM

[Asbelos]

https://dcc-ex.com/reference/hardware/motorboards/motor-board-config.html

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Enter the appropriate pin numbers on the Arduino you will connect to your motor board.

Let’s look at the details of how this works, first here are all the configuration options:

power_pin - This goes to the EN (enable pin) of the motor board; it turns power on and off.

signal_pin - This is the pin that outputs the DCC signal and goes to the PWM input of the motor board. For boards that combine the signal into one pin, like the Arduino Motor Shield, you just need to enter the pin here and connect it to the single PWM pin on the motor board.
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Issue:

Most motor shields/boards assume a DC motor and thus the term "PWM" is normally applied to the Enable pin.
Thus the wording above is incorrect as the signal_pin goes to the DIRECTION input, not the PWM input.

(The fact that we may use PWM on the signal pin or even the brake pin is irrelevant here because that's not how the shields are marked or described in their documentation.)