docs: use brackets for the default value of option arguments

[marcelotduarte]

Following upstream pypa/setuptools#4442
Also, fix long lines in docs.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.43%. Comparing base (39c19c1) to head (7012bab).
Report is 93 commits behind head on main.

Files with missing lines	Patch %	Lines
cx_Freeze/command/bdist_dmg.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2541   +/-   ##
=======================================
  Coverage   81.43%   81.43%           
=======================================
  Files          27       27           
  Lines        4256     4256           
=======================================
  Hits         3466     3466           
  Misses        790      790           

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