Hotfix for sphinx-markdown compatibility

[timkpaine]

Description

Brief description of the changes in this PR.

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactor / code cleanup
• CI / build configuration
• Other (describe below)

Checklist

• Linting passes (make lint)
• Tests pass (make test)
• New tests added for new functionality
• Documentation updated (if applicable)
• Changelog / version bump (if applicable)

[github-actions]

Test Results

83 tests  ±0   83 ✅ ±0   25s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit bc1f53d. ± Comparison against base commit db99efe.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.60%. Comparing base (db99efe) to head (bc1f53d).

Files with missing lines	Patch %	Lines
yardang/sphinx/llms.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
- Coverage   80.61%   80.60%   -0.02%     
==========================================
  Files          15       15              
  Lines        1893     1897       +4     
  Branches      203      203              
==========================================
+ Hits         1526     1529       +3     
- Misses        316      317       +1     
  Partials       51       51              

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