docs: fix broken Markdown link (issue #9149)

[Ketan-Ag]

Resolves #9149.

Description

What is the purpose of this pull request?

This pull request:

• This pull request fixes a broken Markdown link in the DLASET README. The previous LAPACK documentation URL returned a 404 because the referenced Netlib Doxygen page no longer exists. The link has been updated to a current working LAPACK DLASET documentation page

Related Issues

Does this pull request have any related issues?

This pull request does not have any issues beyond #9149.

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

If you answered "yes" to using AI assistance, please provide a short disclosure indicating how you used AI assistance. This helps reviewers determine how much scrutiny to apply when reviewing your contribution. Example disclosures: "This PR was written primarily by Claude Code." or "I consulted ChatGPT to understand the codebase, but the proposed changes were fully authored manually by myself.".

I consulted ChatGPT to help locate the current LAPACK documentation and to assist in writing the pull request summary, but the actual change was authored manually.

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Coverage Report

Package	Statements	Branches	Functions	Lines
lapack/base/dlaset	$\color{green}592/592$ $\color{green}+100.00%$	$\color{green}37/37$ $\color{green}+100.00%$	$\color{green}7/7$ $\color{green}+100.00%$	$\color{green}592/592$ $\color{green}+100.00%$

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