STY: Increase readability slightly

[j-t-1]

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[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.36%. Comparing base (1e1a140) to head (f98529b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pypdf/_writer.py	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2986   +/-   ##
=======================================
  Coverage   96.36%   96.36%           
=======================================
  Files          52       52           
  Lines        8751     8751           
  Branches     1593     1593           
=======================================
  Hits         8433     8433           
  Misses        190      190           
  Partials      128      128           

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