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

[AyushiJain18270]

Ref #{{8641}}.

Description

What is the purpose of this pull request?

This pull request:

• this pr is updation for updation of instances for complesx no in special/croundf

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

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No.

Other

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• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/croundf	$\color{green}159/159$ $\color{green}+100.00%$	$\color{green}5/5$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}159/159$ $\color{green}+100.00%$

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

[stdlib-bot]

PR Commit Message

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

PR-URL: https://github.com/stdlib-js/stdlib/pull/10510
Ref: https://github.com/stdlib-js/stdlib/issues/8641

Co-authored-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: Philipp Burckhardt <pburckhardt@outlook.com>

Please review the above commit message and make any necessary adjustments.

⚠️ Action Required: This PR references tracking issues. Please update the PR description to replace any "Closes", "Fixes", or "Resolves" keywords with "Ref" when referencing these issues.