[css-align-3] A few typos in css-align-3

[dholbert]

Reporting a few typos I ran across when re-reading css-align-3 today:

Typo 1:
Appendix A: Static Position Terminology:
In the "Flex Layout" section, there's link that mentions grid but intends to mention flexbox (" See static position of a grid container child in [CSS-FLEXBOX-1]. ")

s/grid/flex/ might fix this, but also, the linked text is actually pointing to a section whose name is "Absolutely-Positioned Flex Children", so maybe that's the phrase we should use here? (It seems like it's trying to quote a section title when saying "See $foo"). Either way seems fine to me.

Typo 2:
6.1.2. Absolutely-Positioned Boxes (for justify-self)
"The block’s containing block’s inline axis" -- this wants s/The block/The box/

[fantasai]

Fixed, thanks!!