78c944ebc3
* add punctuation highlights for commas as in function parameters
* remove stray `variable.parameter` highlight
* I couldn't find any regressions from this and it fixes an
edge case I ran into (but sadly did not record 😓)
* highlight `fn` as `keyword.function`
* the theme docs have `fn` as an example so it seems fitting
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| .. | ||
| grammars | ||
| queries | ||
| themes | ||
| tutor.txt | ||