Fix typo in print_tree description

[rikhuijzer]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.51%. Comparing base (82c577c) to head (05da07c).
⚠️ Report is 102 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #171   +/-   ##
=======================================
  Coverage   89.51%   89.51%           
=======================================
  Files          10       10           
  Lines         992      992           
=======================================
  Hits          888      888           
  Misses        104      104           

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[ablaom]

Great catch @rikhuijzer