fix: duplicated PDF toc name

[yufeih]

fixes #8392

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (be41c20) 76.74% compared to head (1dbed24) 76.73%.

❗ Current head 1dbed24 differs from pull request most recent head 2b94f5f. Consider uploading reports for the commit 2b94f5f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8663      +/-   ##
==========================================
- Coverage   76.74%   76.73%   -0.02%     
==========================================
  Files         607      607              
  Lines       25057    25057              
==========================================
- Hits        19231    19228       -3     
- Misses       5826     5829       +3     

see 2 files with indirect coverage changes

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