Fix documentation for DatabaseJanitor

[jjmurre]

The DatabaseJanitor now only accepts keyword arguments.

Chore that needs to be done:

• Add newsfragment pipenv run towncrier create [issue_number].[type].rst

Types are defined in the pyproject.toml, issue_number either from issue tracker or the Pull request number

[fizyk]

@jjmurre could you add newsfragment?

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.83%. Comparing base (22944af) to head (5a2ed0f).
Report is 259 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1024      +/-   ##
==========================================
+ Coverage   95.26%   95.83%   +0.57%     
==========================================
  Files          13       13              
  Lines         401      432      +31     
==========================================
+ Hits          382      414      +32     
+ Misses         19       18       -1     

Flag	Coverage Δ
unittests	95.83% <ø> (+0.57%)	⬆️

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