MAINT: Bookmarks / outlines

[MartinThoma]

See #1098

[codecov]

Codecov Report

Merging #1103 (bb47dbd) into main (c420beb) will increase coverage by 0.51%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1103      +/-   ##
==========================================
+ Coverage   91.59%   92.10%   +0.51%     
==========================================
  Files          24       24              
  Lines        4533     4954     +421     
  Branches      932     1043     +111     
==========================================
+ Hits         4152     4563     +411     
- Misses        241      247       +6     
- Partials      140      144       +4     

Impacted Files	Coverage Δ
PyPDF2/_writer.py	91.75% <100.00%> (+2.78%)	⬆️
PyPDF2/constants.py	100.00% <0.00%> (ø)

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