[css-grid] Example 4 from specification

[Gunyon]

I try to learn css-grid and there is a confusing situation in the example 4 form the specs.

These expressions do not seem to be equivalent

grid-area: header-start / sidebar-start / footer-end / sidebar-start;

grid-row: header-start / footer-end; grid-column: sidebar-start / footer-end;

[fantasai]

Wow, that's a lot of typos in there! Should be fixed in 09f6107, let me know if I screwed it up.

[Gunyon]

there are no more confusions, thanks