Fix random hypergraph

[nwlandry]

This fixes #361.

Before I fix the tests, is this what you were picturing @maximelucas and @arashbm?

[maximelucas]

Looks good, thanks Nich! Just a few minor comments

Edit: Oh also the tests don't seem to pass

[codecov]

Codecov Report

Attention: Patch coverage is 98.36066% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.21%. Comparing base (f2e2241) to head (36ab30a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
xgi/generators/random.py	98.27%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
+ Coverage   93.17%   93.21%   +0.04%     
==========================================
  Files          62       62              
  Lines        4701     4733      +32     
==========================================
+ Hits         4380     4412      +32     
  Misses        321      321              

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[nwlandry]

@maximelucas --- any chance you can take one last look?

[maximelucas]

Just a few super minor things for the docs, otherwise approved already, thanks!

[nwlandry]

Thanks for the review, @maximelucas !