docs: improve examples of array/base/assert namespace

[soumajit23]

Resolves #1545

Description

What is the purpose of this pull request?

This pull request:

• improves the readme examples of https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/array/base/assert namespace and updates https://github.com/stdlib-js/stdlib/blob/develop/lib/node_modules/%40stdlib/array/base/assert/examples/index.js

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• resolves #
• fixes #

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• Read, understood, and followed the contributing guidelines.

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@stdlib-js/reviewers

[soumajit23]

@Planeshifter had to run the push with --no-verify as you told. Please review. Thanks!