This seems to correspond to the sentence two lines above:
Similarly, the height is auto by default, which means it will adjust to the content inside.
I look in this documentation, and it seems to be the same behavior:
So I deduce that unlike the auto width, which corresponds to the maximum width, the auto height corresponds to the minimum height.
I hope I’m not talking nonsense.
If I remember correctly, there are also differences in the behavior of margins in height and width; they can merge in one direction and not in the other.