doc: fix path of patch example

[verdie-g]

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8d37ce6) 90.74% compared to head (d9d74f4) 90.74%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1455   +/-   ##
=======================================
  Coverage   90.74%   90.74%           
=======================================
  Files         344      344           
  Lines       11003    11003           
  Branches     1813     1813           
=======================================
  Hits         9985     9985           
  Misses        669      669           
  Partials      349      349           

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[bkoelman]

Thanks!