docs: remove doc_auto_cfg for jlabel

[phenylshima]

Fixes: #87

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.48%. Comparing base (c644ac0) to head (90f55a3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   87.48%   87.48%           
=======================================
  Files          10       10           
  Lines        1047     1047           
=======================================
  Hits          916      916           
  Misses        131      131           

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[Copilot]

Pull request overview

This PR fixes the docs.rs build failure for jlabel by removing the removed doc_auto_cfg nightly feature gate while keeping doc_cfg enabled for docs.rs builds.

Changes:

• Removes doc_auto_cfg from the crate-level docs.rs feature attribute.
• Aligns jlabel with the sibling crate’s existing doc_cfg-only configuration.

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