[css-sizing] typos

[MatsPalmgren]

https://drafts.csswg.org/css-sizing-3/#auto-box-sizes
in the first sentence: s/fromy/from/

https://drafts.csswg.org/css-sizing-3/#fit-content-block-size
in the first sentence: s/finite/definite/
These words have roughly the same meaning in CSS, but "definite" has a normative definition and the phrase "If the available space is definite" is used in multiple places elsewhere so I think it should be preferred.

https://drafts.csswg.org/css-sizing-3/#box-sizing

The box-sizing property switches the box model between asssigning finite sizes such as <length>s and <percentage>s ...

s/asssigning/assigning/
Maybe "finite" should be "definite" here too? If not, then "finite" is probably not the word to use here.

[donovanglover]

I fixed the typos, but I personally find the third sentence confusing.

The box-sizing property switches the box model between assigning ... (implied and <verb>ing)

The word between implies that there are multiple things being talked about, i.e. "between assigning and <something else>".

[fantasai]

@MatsPalmgren OK, fixed typos and switched the last one to fixed.

@gloverdonovan Yes, you're right. I adjusted the wording, let me know if it still seems off? I've been staring at it a bit too long to know anymore.

[donovanglover]

Definitely better than before. I don't know enough about the spec to rewrite this sentence, but I'd personally change the last part from "the content box and the border box" to "the content box and border box values". What do you think?

Edit: Actually not sure if content box has a different meaning than content-box (same for border box and border-box), so I'm not sure if these changes would be valid.