[DOC] Update SelectFiles docstring to match actual behavior

[kimsin98]

Summary

Fixes #2712 through clarification.

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

• Clarifies that SelectFiles does not support lists as inputs.

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[effigies]

Oh. I think I misunderstood #2712. I interpreted it as you saying that

templates["epi"] = "{subject_id}/func/f[10].nii"

would produce the result you describe. For the code above, I would have expected to match f10.nii and f11.nii.

Possibly @mwaskom can clarify whether this was the intended behavior, though it's been a long time since #623.

[codecov]

Codecov Report

Merging #3041 into master will increase coverage by 2.64%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##           master    #3041      +/-   ##
==========================================
+ Coverage   67.53%   70.18%   +2.64%     
==========================================
  Files         344      345       +1     
  Lines       44093    66874   +22781     
  Branches     5555    10123    +4568     
==========================================
+ Hits        29779    46933   +17154     
- Misses      13560    18604    +5044     
- Partials      754     1337     +583

Flag	Coverage Δ
#smoketests	50.33% <ø> (ø)	⬆️
#unittests	68.87% <20%> (+3.87%)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/io.py	58.73% <20%> (+3.79%)	⬆️
nipype/interfaces/nilearn.py	75.25% <0%> (-21.41%)	⬇️
nipype/utils/spm_docs.py	56.75% <0%> (-13.62%)	⬇️
nipype/interfaces/freesurfer/base.py	68.71% <0%> (-11.8%)	⬇️
nipype/interfaces/dipy/stats.py	88.23% <0%> (-11.77%)	⬇️
nipype/interfaces/dipy/registration.py	88.88% <0%> (-11.12%)	⬇️
nipype/workflows/dmri/fsl/tbss.py	78.37% <0%> (-10.82%)	⬇️
nipype/workflows/smri/freesurfer/ba_maps.py	90.27% <0%> (-9.73%)	⬇️
nipype/algorithms/rapidart.py	55.87% <0%> (-8.55%)	⬇️
nipype/workflows/smri/freesurfer/recon.py	65.95% <0%> (-8.52%)	⬇️
... and 256 more

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[effigies]

Looks like we're not going to get clarification on intent, and making the docstring match historical behavior seems safer than fixing a potentially load-bearing bug.