chore: fix JavaScript lint errors (issue #8483)

[Ankit-Trivedi-02]

Resolves #8483

Description

This pull request fixes a JavaScript lint error in the @stdlib/fs/read-dir examples.
Specifically, the doctest for readDir.sync was incorrect, showing false instead of true. This PR updates the comment to match the actual behavior.

Related Issues

This pull request is related to:

• Fix JavaScript lint errors #8483

Questions

When i try to lint specific file in my system it says ESLint couldn't find the plugin "eslint-plugin-stdlib". do you think if i start working with docker this issue will be fixed.

Other

No.

Checklist

• Read, understood, and followed the contributing guidelines.

AI Assistance

• Yes

• [] No

• Code generation (e.g., when writing an implementation or fixing a bug)

• Test/benchmark generation

• Documentation (including examples)

• Research and understanding

uses ai for linting issues and majorly this documentation of PR

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
fs/read-dir	$\color{green}171/171$ $\color{green}+100.00%$	$\color{green}7/7$ $\color{green}+100.00%$	$\color{green}2/2$ $\color{green}+100.00%$	$\color{green}171/171$ $\color{green}+100.00%$

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