Re: [csswg-drafts] [css-grid] Is `span` keyword excluded from Named Grid Lines <custom-ident>?

My bad, sorry, It was mentioned closer, in 7.2.
> In `<line-names>`, the `<custom-ident>` additionally excludes the 
keyword `span`

But maybe to avoid such confusion, and changing/adding a meaning 
retrospectively by ."In all the above productions". We could use just 
(already specified) `<line-names>` (for all `<custom-ident>` excluding
 the keyword span).

(Note, I'm willing to prepare PR if needed ;) )

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