docs: improve doctests for ndarray instances in blas/ext/last-index-of

[udaykakade25]

Progresses #9329

Description

What is the purpose of this pull request?

This pull request:

• improve doctests for ndarray instances in blas/ext/last-index-of

Related Issues

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This pull request has the following related issues:

• none

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Other

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AI Assistance

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{{TODO: add disclosure if applicable}}

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@stdlib-js/reviewers

[stdlib-bot]

Thank you for working on this pull request. However, we cannot accept your contribution as the issue this pull request seeks to resolve has already been addressed in a different pull request or commit.

Thank you again for your interest in stdlib, and we look forward to reviewing your future contributions.