chore: Improved error message for enum

[Stranger6667]

Ref #739

[codecov]

Codecov Report

❌ Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.48%. Comparing base (13f4b97) to head (884d071).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
crates/jsonschema/src/error.rs	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #776      +/-   ##
==========================================
+ Coverage   85.46%   85.48%   +0.02%     
==========================================
  Files          95       95              
  Lines       14564    14589      +25     
==========================================
+ Hits        12447    12472      +25     
  Misses       2117     2117              

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[codspeed-hq]

CodSpeed Performance Report

Merging #776 will not alter performance

_{Comparing dd/enum-error-message (884d071) with master (13f4b97)}

Summary

✅ 47 untouched benchmarks