[css-fonts-4] Clarify range constraints on descriptor values in <font-feature-value-type>
#13324
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Fixes #9926.
Descriptor values in
<font-feature-value-type>rules are currently defined with:https://drafts.csswg.org/css-fonts-4/#font-feature-values-syntax
As commented in the referenced issue,
[0,∞]is not appropriate for all<feature-value-name>.This PR makes use of
<feature-index>but renamed to<font-feature-index>, which is similar to the suggestion to rename<family-name>, in order to avoid using generic production names for specific contexts.Similarly,
<feature-value-name>is also renamed to<font-feature-value-name>.