docs: Update geometric kurtosis README return val

[AkshatOP]

Resolves #5858

Description

What is the purpose of this pull request?

This pull request:

• Fixed a wrong return value

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves #5858

Questions

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No.

Other

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No.

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• Read, understood, and followed the contributing guidelines

---

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/geometric/kurtosis	$\color{green}165/165$ $\color{green}+100.00\%$	$\color{green}9/9$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}165/165$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

Thanks for your contribution; however, this change was already resolved in #5874. As such, I'll need to go ahead and close this PR.