DOC: Fix typos found by copdespell

[DimitriPapadopoulos]

Summary

Fix typos.

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

• Fix part of the typos found by codespell.

[codecov]

Codecov Report

Base: 65.26% // Head: 65.26% // No change to project coverage 👍

Coverage data is based on head (6c7f3b3) compared to base (8f405f6).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3510   +/-   ##
=======================================
  Coverage   65.26%   65.26%           
=======================================
  Files         309      309           
  Lines       40870    40870           
  Branches     5380     5380           
=======================================
  Hits        26672    26672           
  Misses      13124    13124           
  Partials     1074     1074           

Flag	Coverage Δ
unittests	65.04% <100.00%> (ø)

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

Impacted Files	Coverage Δ
nipype/algorithms/__init__.py	100.00% <ø> (ø)
nipype/algorithms/confounds.py	67.35% <ø> (ø)
nipype/algorithms/metrics.py	56.28% <ø> (ø)
nipype/algorithms/rapidart.py	34.42% <ø> (ø)
nipype/interfaces/ants/base.py	78.84% <ø> (ø)
nipype/interfaces/ants/legacy.py	66.66% <ø> (ø)
nipype/interfaces/ants/registration.py	73.25% <ø> (ø)
nipype/interfaces/ants/resampling.py	84.78% <ø> (ø)
nipype/interfaces/base/core.py	87.96% <ø> (ø)
nipype/interfaces/brainsuite/brainsuite.py	74.68% <ø> (ø)
... and 47 more

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[effigies]

Thanks!