docs: fix incorrect punctuation in function description for blas/ext/base/dsnansumpw

[headlessNode]

Description

What is the purpose of this pull request?

This pull request:

• fix incorrect punctuation in the function description

Related Issues

Does this pull request have any related issues?

No.

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.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dsnansumpw	$\color{green}457/457$ $\color{green}+100.00\%$	$\color{green}59/59$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}457/457$ $\color{green}+100.00\%$

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

[headlessNode]

Test failure from a downstream package #3268 .

[kgryte]

LGTM. Thanks for following up on this, @headlessNode!

[kgryte]

As the CI failure is due to an expected failure in a downstream package, I'll go ahead and merge.