[css-syntax] make "plus sign" match other 2 items

[skratchdot]

when consuming a token, the first instruction for PLUS SIGN, HYPHEN-MINUS, and FULL STOP are all the same, but the PLUS SIGN instructions are missing a comma.

visit: https://www.w3.org/TR/css-syntax-3/#consume-comment

search the page for:

If the input stream starts with a number, reconsume the current input code point, consume a numeric token and return it. 

there is only 1 instance.

search the page for:

If the input stream starts with a number, reconsume the current input code point, consume a numeric token, and return it.

there are 2 instances.

i think all 3 versions should match.

[skratchdot]

Marked as non substantive for IPR from ash-nazg.

[skratchdot]

If removing the comma is preferred for all 3, then I will make that changes. Just let me know.

[tabatkins]

Nope, oxford comma is definitely preferred, I just missed it in that spot. Thanks!