docs: improve doctests for ndarray instances in blas/base/ndarray/ddot

[AyushiJain18270]

Resolves #{ a part of #9329}

Description

What is the purpose of this pull request?

This pull request:

Examples use ndarray instances directly
Outdated helper utilities like ndarray2array are no longer used
The examples match current stdlib ndarray usage patterns
Code shown in docs runs correctly with the current ndarray API

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• #{ a part of [RFC]: Improve doctests for ndarray instances in documentation examples (tracking issue) #9329}

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Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/ndarray/ddot	$\color{green}108/108$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}1/1$ $\color{green}+100.00%$	$\color{green}108/108$ $\color{green}+100.00%$

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

[kgryte]

@AyushiJain18270 Thank you for your PR; however, the proposed changes are not desired. We are interested in cases where we need to update // returns annotations. The examples that you changed don't have returns annotations (i.e., doctesting) and the use of ndarray2array is intentional, as those examples are intended to be run and print the contents of ndarrays to stdout. As such, I'll go ahead and close this PR.

Thanks again for your interest in stdlib, and we look forward to your future contributions!