Fix doc parts

[tmartinfr]

Successful PR Checklist:

• Tests
  • (not applicable?)
• Documentation
  • (not applicable?)
• Had a good time contributing?

[codecov]

Codecov Report

Merging #377 (bc1bce3) into master (4e96713) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #377   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         1604      1604           
  Branches       173       173           
=========================================
  Hits          1604      1604           

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[ewjoachim]

Thanks for this contribution

[ewjoachim]

https://pypi.org/project/procrastinate/0.18.1/