docs: improve doctests for complex number instances

[fiboNacci1163]

Resolves a part of #8641.

Description

What is the purpose of this pull request?

This pull request:

• Updates the documentation examples in the math/base/special namespace to use the new compact complex instance doctest notation.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Improve doctests for complex number instances in documentation examples (tracking issue) #8641.

Questions

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No.

Other

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No.

Checklist

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• Read, understood, and followed the contributing guidelines.

AI Assistance

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/ccis	$\\color{green}198/198$ $\\color{green}+100.00\\%$	$\\color{green}6/6$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}198/198$ $\\color{green}+100.00\\%$
math/base/special	$\\color{red}67083/82855$ $\\color{green}+80.96\\%$	$\\color{red}1071/1117$ $\\color{green}+95.88\\%$	$\\color{red}12/800$ $\\color{green}+1.50\\%$	$\\color{red}67083/82855$ $\\color{green}+80.96\\%$

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

[kgryte]

LGTM