docs: update related packages sections

[stdlib-bot]

This PR

• updates the related packages section of READMEs to include links to related packages.

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
blas/ext/base/dnancount	$\color{green}360/360$ $\color{green}+100.00%$	$\color{green}18/18$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}360/360$ $\color{green}+100.00%$

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