DOC: Fix a few more typos

[DimitriPapadopoulos]

Summary

Fix typos.

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

• Fix a few more typos.

[codecov]

Codecov Report

Base: 65.29% // Head: 65.29% // No change to project coverage 👍

Coverage data is based on head (223e69d) compared to base (c634f29).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3516   +/-   ##
=======================================
  Coverage   65.29%   65.29%           
=======================================
  Files         309      309           
  Lines       40873    40873           
  Branches     5380     5380           
=======================================
  Hits        26687    26687           
  Misses      13108    13108           
  Partials     1078     1078           

Flag	Coverage Δ
unittests	65.03% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nipype/interfaces/afni/utils.py	81.86% <ø> (ø)
nipype/interfaces/diffusion_toolkit/dti.py	63.20% <ø> (ø)
nipype/interfaces/dtitk/utils.py	92.66% <ø> (ø)
nipype/interfaces/minc/minc.py	85.20% <ø> (ø)
nipype/interfaces/mipav/developer.py	100.00% <ø> (ø)
nipype/interfaces/semtools/diffusion/gtract.py	100.00% <ø> (ø)
nipype/interfaces/slicer/generate_classes.py	8.75% <ø> (ø)
nipype/interfaces/slicer/registration/brainsfit.py	100.00% <ø> (ø)
...e/interfaces/slicer/registration/brainsresample.py	100.00% <ø> (ø)
nipype/interfaces/spm/model.py	43.20% <ø> (ø)
... and 1 more

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[effigies]

Just checking: Are you wanting these to be separate PRs, or am I merging too quickly? Feel free to make some additional cleanups in this PR if you like; as long as the commits are self-contained and have good messages, I can make suggestions on individual commits.

[DimitriPapadopoulos]

I fear very large merge requests may be difficult to review/accept. This is the last one!

[effigies]

Sounds good. Thanks!