chore: address commit comments for commit dd4ec1f (issue #7454)

[rk-aditeem]

Resolves #7457

Description

Removed the extra empty line
Added an Oxford comma after “mu,”
Re‐introduced the empty “Related packages” section and its comment

Related Issues

#7457

Checklist

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/gumbel/quantile	$\color{green}296/296$ $\color{green}+100.00\%$	$\color{green}23/23$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}296/296$ $\color{green}+100.00\%$

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

[kgryte]

Unfortunately, none of the changes made to this file are what were requested in dd4ec1f. This PR cannot move forward until those changes are made and the current changes are reverted.