add missing message to a Fonts API error

[sarah11918]

Changes

This adds the @message property (and message to the ErrorData object) for one of the new error messages. @florian-lefebvre or someone please correct/verify the actual content!

Testing

Not tested, but the @message property is the one that generates the error message block in docs. Without it, we only get a "What went wrong?" section. (This might also affect the error message people see?)

e.g. without: (we had one slip by earlier!)

vs most other error messages:

Docs

All for docs!

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Latest commit: 2e1a5d5

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[florian-lefebvre]

The error usage must be updated too, I'll look into it when I can

[florian-lefebvre]

Tests should pass

[codspeed-hq]

CodSpeed Performance Report

Merging #13612 will not alter performance

_{Comparing sarah11918-patch-3 (f3ed12b) with main (29ab38e)}

Summary

✅ 6 untouched benchmarks