[css-sizing-4] Add example for how %-block-size percentages resolve for min/max size calculation.

[bfgeek]

E.g.

<div id=container style="height: 100px; float: left;">
  <div style="height: 100%; aspect-ratio: 1/1;"></div>
</div>

The width of "container" should be 100px(?). Adding an example would be helpful.

[fantasai]

@bfgeek We added an example! Let us know if it looks OK!