bench: refactor benchmarks and update function parameter description

[gunjjoshi]

Description

What is the purpose of this pull request?

This pull request:

• updates the function parameter description in the C implementation of rempio2Kernel, in math/base/special/rempio2.
• updates benchmarks according to latest conventions.

Related Issues

Does this pull request have any related issues?

None.

Questions

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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-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/rempio2	$\color{red}893/907$ $\color{green}+98.46\%$	$\color{red}81/86$ $\color{green}+94.19\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{red}893/907$ $\color{green}+98.46\%$

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

[kgryte]

LGTM. Thanks for following up on this, @gunjjoshi!