DOC: Fix typos

[jhlegarreta]

Fix typos.

[jhlegarreta]

@arokem @skoudoro reviews are welcome. Thanks.

[codecov-io]

Codecov Report

Merging #1876 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1876   +/-   ##
=======================================
  Coverage   84.37%   84.37%           
=======================================
  Files         118      118           
  Lines       14411    14411           
  Branches     2273     2273           
=======================================
  Hits        12159    12159           
  Misses       1729     1729           
  Partials      523      523

Impacted Files	Coverage Δ
dipy/denoise/noise_estimate.py	79.12% <ø> (ø)	⬆️
dipy/workflows/reconst.py	77.22% <ø> (ø)	⬆️
dipy/reconst/dki_micro.py	91.97% <ø> (ø)	⬆️
dipy/align/streamlinear.py	87.09% <ø> (ø)	⬆️
dipy/tracking/utils.py	88.95% <ø> (ø)	⬆️
dipy/workflows/workflow.py	93.18% <ø> (ø)	⬆️
dipy/workflows/denoise.py	40% <ø> (ø)	⬆️
dipy/reconst/ivim.py	84% <ø> (ø)	⬆️
dipy/segment/clustering.py	94.63% <ø> (ø)	⬆️
dipy/viz/projections.py	20% <ø> (ø)	⬆️
... and 7 more

[skoudoro]

many good catches! Thank you a lot for this meticulous work @jhlegarreta! merging