Fix typos found by codespell

[zuphilip]

No description provided.

[codecov]

Codecov Report

Merging #220 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #220   +/-   ##
=======================================
  Coverage   98.65%   98.65%           
=======================================
  Files          46       46           
  Lines        2084     2084           
=======================================
  Hits         2056     2056           
  Misses         28       28

Impacted Files	Coverage Δ
annif/project.py	100% <ø> (ø)	⬆️
annif/vocab.py	100% <ø> (ø)	⬆️

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[osma]

Thanks!