[csswg-drafts] [css-backgrounds] Incorrect value dfn for border-color and background-clip

tidoust has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-backgrounds] Incorrect value dfn for border-color and background-clip ==
The [`border-color` definition](https://drafts.csswg.org/css-backgrounds-4/#propdef-border-color) seems to be using parentheses for grouping instead of brackets as described in [Component value combinators](https://drafts.csswg.org/css-values-4/#component-combinators). Correct value should be `[<color>{1,4}]#`.

Also, the "Value" header link is wrong, it should target `https://drafts.csswg.org/css-backgrounds-4/#values` as in all other property definition tables.

Similarly, I would expect to be able to parse the [new values of `background-clip`](https://drafts.csswg.org/css-backgrounds-4/#background-clip) using the usual Value Definition Syntax. For that to be possible, value should be `text | border`, and not `text, border`.

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2916 using your GitHub account