Mention in help text that 'draft' is not supported in DANDI:<dandiset>/<version>

[jwodder]

Closes #1058.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.41%. Comparing base (e4dc875) to head (df909dc).
Report is 1020 commits behind head on master.

Files	Patch %	Lines
dandi/dandiarchive.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1062      +/-   ##
==========================================
+ Coverage   88.35%   88.41%   +0.05%     
==========================================
  Files          72       72              
  Lines        9250     9250              
==========================================
+ Hits         8173     8178       +5     
+ Misses       1077     1072       -5     

Flag	Coverage Δ
unittests	88.41% <0.00%> (+0.05%)	⬆️

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[yarikoptic]

thanks!

[github-actions]

🚀 PR was released in 0.45.1 🚀