docs: improve doctests for ndarray instances

[Venkat5599]

Resolves #8850

Description

This pull request improves the JSDoc examples in the ndarray/count-if package by updating doctests to use the new ndarray instance notation format instead of explicit .get() method calls.

Changes made:

• Updated the JSDoc example in lib/main.js to use // returns <ndarray>[ 5 ] instead of calling .get() and separately showing the returned value
• This makes the doctest more compact and clearly shows the expected output format

Why this change?
This RFC seeks to leverage recent improvements in the doctest framework which now supports ndarray instance notation. This change makes documentation examples more concise and easier to understand.

Related Issues

This pull request implements improvements requested in:

• bench: refactor to use string interpolation in array/base/bifurcate-indices-by #8850 - RFC: Improve doctests for ndarray instances in ndarray

Questions

No questions for reviewers.

Other

This change follows the exact pattern established in commit 46d9a44 as referenced in the RFC. The modification is minimal, focused, and does not alter any functionality—only documentation clarity.

Checklist

• Read, understood, and followed the contributing guidelines.

AI Assistance

• No

This PR was fully authored manually by myself without AI assistance.

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Coverage Report

Package	Statements	Branches	Functions	Lines
ndarray/count-falsy	$\color{red}336/439$ $\color{green}+76.54%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{red}0/3$ $\color{green}+0.00%$	$\color{red}336/439$ $\color{green}+76.54%$
ndarray/count-if	$\color{red}360/539$ $\color{green}+66.79%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{red}0/3$ $\color{green}+0.00%$	$\color{red}360/539$ $\color{green}+66.79%$

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

[kgryte]

/stdlib merge

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