[STY] fix some remark warnings

[Remi-Gau]

I was getting those locally.

Not sure why they are not caught in CI.

[DimitriPapadopoulos]

What sort of errors do you get, and from which linter? The reason for the local warnings might be different versions.

[Remi-Gau]

jsut did the following on master and tried to use a node version close to the one used in CI

$ nvm install 22                                   
$ node --version
v22.13.0
$ npm --version
10.9.2
$ npm install `cat npm-requirements.txt` 
$ npx remark src/**/*.md --frail --rc-path .remarkrc 

src/appendices/arterial-spin-labeling.md: no issues found
src/appendices/contributors.md: no issues found
src/appendices/coordinate-systems.md: no issues found
src/appendices/cross-modality-correspondence.md: no issues found
src/appendices/entities.md: no issues found
src/appendices/entity-table.md: no issues found
src/appendices/file-collections.md: no issues found
src/appendices/hed.md: no issues found
src/appendices/licenses.md: no issues found
src/appendices/meg-file-formats.md: no issues found
src/appendices/meg-systems.md: no issues found
src/appendices/qmri.md: no issues found
src/appendices/schema.md: no issues found
src/appendices/units.md: no issues found
src/CHANGES.md
40:53-40:80      warning Unexpected GFM autolink literal, expected regular autolink, add `<` before and `>` after          no-literal-urls             remark-lint

src/common-principles.md
18:1             warning Unexpected unordered list marker `*`, expected `-`                                                unordered-list-marker-style remark-lint
18:3             warning Unexpected `1` space between list item marker and content, expected `3` spaces, add `2` spaces    list-item-indent            remark-lint
19:1             warning Unexpected unordered list marker `*`, expected `-`                                                unordered-list-marker-style remark-lint
19:3             warning Unexpected `1` space between list item marker and content, expected `3` spaces, add `2` spaces    list-item-indent            remark-lint
20:1             warning Unexpected unordered list marker `*`, expected `-`                                                unordered-list-marker-style remark-lint
20:3             warning Unexpected `1` space between list item marker and content, expected `3` spaces, add `2` spaces    list-item-indent            remark-lint
486:74-487:1     warning Unexpected `0` blank lines between list items, expected `1` blank line, add `1` blank line        list-item-spacing           remark-lint
  [cause]:
    484:1-486:74 info    Spaced list item first defined here                                                               list-item-spacing           remark-lint
608:59-609:1     warning Unexpected `0` blank lines between list items, expected `1` blank line, add `1` blank line        list-item-spacing           remark-lint
  [cause]:
    607:1-608:59 info    Spaced list item first defined here                                                               list-item-spacing           remark-lint
610:33-611:1     warning Unexpected `0` blank lines between list items, expected `1` blank line, add `1` blank line        list-item-spacing           remark-lint
  [cause]:
    607:1-608:59 info    Spaced list item first defined here                                                               list-item-spacing           remark-lint

src/derivatives/common-data-types.md: no issues found
src/derivatives/imaging.md: no issues found
src/derivatives/introduction.md: no issues found
src/extensions.md: no issues found
src/glossary.md: no issues found
src/index.md: no issues found
src/introduction.md
181:6            warning Unexpected `4` spaces between list item marker and content, expected `3` spaces, remove `1` space list-item-indent            remark-lint

src/longitudinal-and-multi-site-studies.md
99:1             warning Unexpected `2` blank lines before node, expected up to `1` blank line, remove `1` blank line      no-consecutive-blank-lines  remark-lint

src/modality-agnostic-files.md
549:1-549:44     warning Unexpected unused definition, expected no definition or one or more references to `object`        no-unused-definitions       remark-lint
551:1-551:61     warning Unexpected unused definition, expected no definition or one or more references to `string`        no-unused-definitions       remark-lint
553:1-553:57     warning Unexpected unused definition, expected no definition or one or more references to `uri`           no-unused-definitions       remark-lint

src/modality-specific-files/behavioral-experiments.md: no issues found
src/modality-specific-files/electroencephalography.md: no issues found
src/modality-specific-files/genetic-descriptor.md: no issues found
src/modality-specific-files/intracranial-electroencephalography.md: no issues found
src/modality-specific-files/magnetic-resonance-imaging-data.md: no issues found
src/modality-specific-files/magnetic-resonance-spectroscopy.md: no issues found
src/modality-specific-files/magnetoencephalography.md: no issues found
src/modality-specific-files/microscopy.md: no issues found
src/modality-specific-files/motion.md: no issues found
src/modality-specific-files/near-infrared-spectroscopy.md: no issues found
src/modality-specific-files/physiological-recordings.md: no issues found
src/modality-specific-files/positron-emission-tomography.md: no issues found
src/modality-specific-files/task-events.md: no issues found
src/pregh-changes.md: no issues found
src/schema/README.md: no issues found

⚠ 15 warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.45%. Comparing base (4218b87) to head (9c9591e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2026   +/-   ##
=======================================
  Coverage   82.45%   82.45%           
=======================================
  Files          17       17           
  Lines        1499     1499           
=======================================
  Hits         1236     1236           
  Misses        263      263           

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