Bernoulli, OrderedProbit, ZeroInflatedBinomial, ZeroInflatedNegativeBinomial docstring update

[mariyayb]

What is this PR about?
update docstring as in issue for Bernoulli, OrderedProbit, ZeroInflatedBinomial, ZeroInflatedNegativeBinomial classes
#DataUmbrellaPyMCSprint
Cc: @reshamas
Cc: @saurbhc

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Are the changes covered by tests and docstrings?
• Fill out the short summary sections 👇

Major / Breaking Changes

• None

Bugfixes / New features

• None

Docs / Maintenance

• Yes, as per issue Update docstrings for better rendering on website and numpydoc compliance #5459

Reference

Towards #5459

[michaelosthege]

Thanks, this looks good!

[reshamas]

@mariyayb
Would you be able to remove "#5459" from the title of the PR and add it to the description?
Example:

### Reference
Towards #5459 

[reshamas]

@mariyayb Thanks for the PR. If you are working with a pair partner can you add their GitHub handle to the above description?
Example:

cc:  @xxxxx

[codecov]

Codecov Report

Merging #5961 (4eb73de) into main (966aabf) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5961      +/-   ##
==========================================
+ Coverage   89.41%   89.44%   +0.03%     
==========================================
  Files          73       73              
  Lines       13292    13292              
==========================================
+ Hits        11885    11889       +4     
+ Misses       1407     1403       -4     

Impacted Files	Coverage Δ
pymc/distributions/discrete.py	99.21% <ø> (ø)
pymc/step_methods/hmc/base_hmc.py	90.55% <0.00%> (+0.78%)	⬆️
pymc/parallel_sampling.py	86.79% <0.00%> (+0.99%)	⬆️