DOC: Document make_dataset_description

[larsoner]

Closes #1024

[codecov]

Codecov Report

Merging #1029 (653b2f1) into main (13d2b97) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1029   +/-   ##
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  Coverage   95.17%   95.17%           
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  Files          25       25           
  Lines        3774     3774           
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  Hits         3592     3592           
  Misses        182      182           

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[larsoner]

Seems to have rendered okay

https://output.circle-artifacts.com/output/job/488d0110-fb7a-4221-a426-f5a106dca60c/artifacts/0/dev/auto_examples/convert_mne_sample.html

[sappelhoff]

Thanks @larsoner!