Compare to other modalities' pipelines

[tsalo]

Closes #830.

Changes proposed in this pull request

• Add documentation for fMRIPrep/sMRIPrep users. The idea is to make it easier to orient yourself to DWI processing if you're coming from a similar modality.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.48%. Comparing base (789be41) to head (3d291f1).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #837   +/-   ##
=======================================
  Coverage   28.48%   28.48%           
=======================================
  Files          68       68           
  Lines       10152    10152           
  Branches     1146     1146           
=======================================
  Hits         2892     2892           
  Misses       7162     7162           
  Partials       98       98           

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