chore: fix style and return values

[anxhukumar]

Resolves #5863

Description

What is the purpose of this pull request?

This pull request:

• Fixes styling to comply with convention and corrects the return values of documentation and comments.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves Address commit comments (commit a74d773) #5863

Questions

Any questions for reviewers of this pull request?

No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/frechet/logcdf	$\color{green}324/324$ $\color{green}+100.00\%$	$\color{green}27/27$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}324/324$ $\color{green}+100.00\%$

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

[kgryte]

LGTM