DOC: Fix typos newly found by codespell

[DimitriPapadopoulos]

Summary

List of changes proposed in this PR (pull-request)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (661dd1d) 63.18% compared to head (02761c9) 63.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3606   +/-   ##
=======================================
  Coverage   63.18%   63.18%           
=======================================
  Files         308      308           
  Lines       40809    40809           
  Branches     5652     5652           
=======================================
  Hits        25784    25784           
  Misses      14013    14013           
  Partials     1012     1012           

Files	Coverage Δ
nipype/interfaces/afni/preprocess.py	81.00% <100.00%> (ø)
nipype/interfaces/dcmstack.py	34.83% <ø> (ø)
nipype/interfaces/dipy/base.py	75.65% <ø> (ø)
nipype/interfaces/freesurfer/preprocess.py	63.88% <100.00%> (ø)
nipype/interfaces/freesurfer/utils.py	60.48% <ø> (ø)
nipype/interfaces/io.py	48.06% <ø> (ø)
nipype/interfaces/semtools/brains/utilities.py	100.00% <ø> (ø)
nipype/interfaces/semtools/diffusion/gtract.py	100.00% <ø> (ø)
...semtools/diffusion/tractography/ukftractography.py	100.00% <ø> (ø)
...pe/interfaces/semtools/segmentation/specialized.py	100.00% <ø> (ø)
... and 2 more

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