chore: fix JavaScript lint errors (issue #6943)

[rajanarahul93]

Resolves #6943.

Description

What is the purpose of this pull request?

This pull request:

• Fixes JavaScript lint errors identified in the GitHub Actions workflow, including:
  • Removing or rephrasing a TODO comment in main.js
  • Fixing JSDoc return value mismatch in sync.js

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves Fix JavaScript lint errors #6943

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

---

@stdlib-js/reviewers

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[kgryte]

LGTM after discarding undesired changes. Thank you for your first PR.