docs: update blas/ext/base/ndarray TypeScript declaration example code

[stdlib-bot]

This PR updates TypeScript declarations for the @stdlib/blas/ext/base/ndarray namespace.

Reviewer Checklist

• Check the scope of the changes (following Conventional Commits):
  • Are these new APIs? Then this is a feat.
  • Are these changes to existing APIs that could break compatibility? Then this is a feat! (i.e., a breaking change).
  • Are these only documentation changes to existing APIs? Then this is docs.
• Update the PR title to align with the change type (feat, feat!, or docs).
• Approve the PR once you are confident about the classification and changes made.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/ndarray	$\color{red}2764/3072$ $\color{green}+89.97%$	$\color{green}45/45$ $\color{green}+100.00%$	$\color{red}0/22$ $\color{green}+0.00%$	$\color{red}2764/3072$ $\color{green}+89.97%$

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

[stdlib-bot]

PR Commit Message

docs: update `blas/ext/base/ndarray` TypeScript declaration example code

PR-URL: https://github.com/stdlib-js/stdlib/pull/9793

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: stdlib-bot <82920195+stdlib-bot@users.noreply.github.com>

Please review the above commit message and make any necessary adjustments.