[FIX] Clarify that dataset_description.Genetics object is required for genetics data

[sappelhoff]

also clarify that Genetics.Dataset is required if Genetics is supplied.

closes #1395

• old: https://bids-specification.readthedocs.io/en/latest/modality-specific-files/genetic-descriptor.html
• new: https://bids-specification--1442.org.readthedocs.build/en/1442/modality-specific-files/genetic-descriptor.html

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.12 ⚠️

Comparison is base (8f21b45) 88.01% compared to head (208daf4) 87.90%.

❗ Current head 208daf4 differs from pull request most recent head 805a778. Consider uploading reports for the commit 805a778 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1442      +/-   ##
==========================================
- Coverage   88.01%   87.90%   -0.12%     
==========================================
  Files          14       14              
  Lines        1268     1273       +5     
==========================================
+ Hits         1116     1119       +3     
- Misses        152      154       +2     

see 1 file with indirect coverage changes

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[effigies]

Woops. Double approved. Must be really good.

[sappelhoff]

Woops. Double approved. Must be really good.

you should have double-approved #1444 because that's almost literally your suggestion ;-)

(actually, I should have acknowledged you in the commit there)