docs: remove invalid numpy keyword from ndarray/nans

[Planeshifter]

Description

What is the purpose of this pull request?

This pull request:

• Removes the "numpy.nans" keyword from package.json. NumPy has no nans() function, so this keyword was factually incorrect. No replacement is added since there is no direct NumPy equivalent for a NaN-filling array-creation function.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• stdlib-js/todo#2774

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

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

This PR was written primarily by Claude Code.

---

@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
ndarray/nans	$\color{green}207/207$ $\color{green}+100.00%$	$\color{green}32/32$ $\color{green}+100.00%$	$\color{green}1/1$ $\color{green}+100.00%$	$\color{green}207/207$ $\color{green}+100.00%$

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