docs: fix broken Markdown link (issue #9133)

[manit2004]

Resolves #9133

Description

What is the purpose of this pull request?

This pull request:

• This PR fixes a broken Markdown link in the gger README documentation.

Changes

• Updated the dger reference link from the old LAPACK 3.6.1 documentation to the current LAPACK documentation
• Old URL: https://www.netlib.org/lapack/explore-html-3.6.1/d7/d15/group__double__blas__level2_ga458222e01b4d348e9b52b9343d52f828.html
• New URL: https://netlib.org/lapack/explore-html//d8/d75/group__ger_gaef5d248da0fdfb62bccb259725935cb8.html

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• Fix broken Markdown link: https://www.netlib.org/lapack/explore-html-3.6.1/d7/d15/group__double__blas__level2_ga458222e01b4d348e9b52b9343d52f828.html #9133

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.".

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/base/gger	$\color{green}611/611$ $\color{green}+100.00%$	$\color{green}57/57$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}611/611$ $\color{green}+100.00%$

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