edited doc string to correct order

Author: axiezai

nipype/interfaces/mrtrix3/preprocess.py

@@ -343,13 +343,12 @@ class DWIPreproc(MRTrix3Base):
  >>> preproc = mrt.DWIPreproc()
  >>> preproc.inputs.in_file = 'dwi.mif'
  >>> preproc.inputs.rpe_options = '-rpe_none'
- >>> preproc.inputs.eddy_options = '"--slm=linear --repol"'
  >>> preproc.inputs.out_file = "preproc.mif"
  >>> preproc.inputs.grad_file = "dwi.b"
  >>> preproc.inputs.ro_time = 0.165240 # 'TotalReadoutTime' in BIDS JSON metadata files
  >>> preproc.inputs.pe_dir = 'j' # 'PhaseEncodingDirection' in BIDS JSON metadata files
  >>> preproc.cmdline
- `dwifslpreproc dwi.mif preproc.mif -eddy_options "--slm=linear " -rpe_none -pe_dir j -grad dwi.b -readout_time 0.165240`
+ `dwifslpreproc dwi.mif preproc.mif -rpe_none -pe_dir j -readout_time 0.165240 -grad dwi.b`
  """
 
  _cmd = "dwifslpreproc"