docs: replace manual for loop in examples

[hrshya]

Resolves none .

Description

What is the purpose of this pull request?

This pull request:

• replaces manual for loop in examples for math/base/special/polygamma, math/base/special/pow, math/base/special/powm1, math/base/special/rad2deg, math/base/special/rad2degf and math/base/special/rcbrt packages.

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves no related issues.

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-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/polygamma	$\color{red}1266/1318$ $\color{green}+96.05\%$	$\color{red}128/155$ $\color{green}+82.58\%$	$\color{green}16/16$ $\color{green}+100.00\%$	$\color{red}1266/1318$ $\color{green}+96.05\%$
math/base/special/pow	$\color{red}1380/1382$ $\color{green}+99.86\%$	$\color{red}119/120$ $\color{green}+99.17\%$	$\color{green}11/11$ $\color{green}+100.00\%$	$\color{red}1380/1382$ $\color{green}+99.86\%$
math/base/special/powm1	$\color{green}268/268$ $\color{green}+100.00\%$	$\color{green}25/25$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}268/268$ $\color{green}+100.00\%$
math/base/special/rad2deg	$\color{green}154/154$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}154/154$ $\color{green}+100.00\%$
math/base/special/rad2degf	$\color{green}159/159$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}159/159$ $\color{green}+100.00\%$
math/base/special/rcbrt	$\color{green}186/186$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}186/186$ $\color{green}+100.00\%$

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

[kgryte]

@hrshya Would you mind resolving the CI failures?

[kgryte]

In particular, the examples failures. The test failures stem from tooling limitations, it seems.