[css-values] Wrong autolinks

[xfq]

In https://drafts.csswg.org/css-values-3/#integers :

The first digit of an integer may be immediately preceded by - or + to indicate the integer’s sign.

'+' links to the next-sibling combinator, which is incorrect here.

There are also some other similar errors in this specification, for example, '+' in <number>, * in calc() etc.

[tabatkins]

Ah, those probably shouldn't be autolinks at all; I'm just trying to style them in the CSS fashion. Will change them.

[fantasai]

Fixed, thanks!