[css-sizing-3] max-content sizes of replaced elements errors

https://drafts.csswg.org/css-sizing-3/#intrinsic-sizes which discusses the max-content sizes of replaced elements is a bit off in a few ways:

The conditional for when this text triggers hooks the text into the undefined cases in CSS2.1, but the text defines a bunch of cases to which the conditional doesn't apply.
The conditional is above bolded text, so it's not obvious that it limits the text below it.
The text claims to apply to boxes with / without preferred aspect ratio, but it really should apply specifically to replaced elements.
The first bullet point of the last case can't apply under the conditional, and is non-Web-compatible otherwise, so should be deleted.

Original commit of this section: c42c80f

@cbiesinger

@cbiesinger @dholbert Mind reviewing the updated section? :)

In this line:

Note: Note that when the box has a [=preferred aspect ratio=],

I would remove the "Note that" as it's repetitive.

Otherwise, looks good, except I have no idea if removing 300x150 from boxes with an aspect ratio is web compatible.

Looks good to me.

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