docs: improve doctests for complex number instances in math/base/special/cflipsign

[kshitijgarg2811-oss]

Progresses part of #8641

Description

What is the purpose of this pull request?

This pull request:

• updates documentation examples for math/base/special/cflipsign to use complex number instance notation (e.g., returns [ 4.2, -5.5 ]) instead of decomposing values using realf and imagf, in accordance with the RFC guidance.

No functional code changes were made. Only documentation examples were updated.

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

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

Checklist

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

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/cflipsign	$\color{green}149/149$ $\color{green}+0.00%$	$\color{green}7/7$ $\color{green}+0.00%$	$\color{green}2/2$ $\color{green}+0.00%$	$\color{green}149/149$ $\color{green}+0.00%$

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