[css-sizing-4] Section „Percentage Sizing“ is empty

[fabb]

The section „Percentage Sizing“ is empty, just contains the text „…“:

https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/Overview.bs#L967

[Loirooriol]

It's not the only empty section, it's diff spec over Level 3

csswg-drafts/css-sizing-4/Overview.bs

Lines 42 to 45 in 9936abd

	ISSUE: This is a diff spec over <a href="https://www.w3.org/TR/css-sizing-3/">CSS Sizing Level 3</a>.
	It is currently an Exploratory Working Draft:
	if you are implementing anything, please use Level 3 as a reference.
	We will merge the Level 3 text into this draft once it reaches CR.