Fix and improve negative binomial distribution#960

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Arlofin wants to merge 8 commits intomathnet:masterfrom

Commits on Sep 30, 2022

Fix the parameter descriptions of the negative binomial distribution
Arlofin
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Handle p = 1 and r = 0 edge cases in PMF of the negative binomial distribution
Arlofin
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Commits on Oct 1, 2022

Adjust the unit tests of the negative binomial distribution
Arlofin
committed