[DOC] update doc on how to filter files and what files gets upsampled

[Remi-Gau]

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[codecov]

Codecov Report

Merging #494 (3a872f9) into dev (bb2eb42) will not change coverage.
The diff coverage is n/a.

❗ Current head 3a872f9 differs from pull request most recent head 2bb7354. Consider uploading reports for the commit 2bb7354 to get more accurate results

@@           Coverage Diff           @@
##              dev     #494   +/-   ##
=======================================
  Coverage   73.52%   73.52%           
=======================================
  Files         192      192           
  Lines        4004     4004           
=======================================
  Hits         2944     2944           
  Misses       1060     1060           

Flag	Coverage Δ
unittests	73.52% <ø> (ø)

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Impacted Files	Coverage Δ
src/bids_model/applyTransformersToEventsTsv.m	86.66% <ø> (ø)
src/defaults/checkOptions.m	91.11% <ø> (ø)
src/workflows/preproc/bidsSpatialPrepro.m	78.26% <ø> (ø)

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