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

[sujalc879]

Resolves a part of #8641 .

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@stdlib-js/reviewers

[stdlib-bot]

Hello! 👋

We've noticed that you've been opening a number of PRs addressing good first issues. Thank you for your interest and enthusiasm!

Now that you've made a few contributions, we suggest no longer working on good first issues. Instead, we encourage you to prioritize cleaning up any PRs which have yet to be merged and then proceed to work on more involved tasks.

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For ideas for future PRs, feel free to search the codebase for TODOs and FIXMEs and be sure to check out other open issues on the issue tracker. Cheers!

[sujalc879]

also made changes in lib/node_modules/@stdlib/math/base/special/cceiln/README.md take a look once

[stdlib-bot]

⚠️ Tracking Issue Closure Warning ⚠️

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[kgryte]

/stdlib merge