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
random/array/cosine	$\\color{green}212/212$ $\\color{green}+100.00\\%$	$\\color{green}3/3$ $\\color{green}+100.00\\%$	$\\color{green}0/0$ $\\color{green}+100.00\\%$	$\\color{green}212/212$ $\\color{green}+100.00\\%$
random/base/negative-binomial	$\\color{green}534/534$ $\\color{green}+100.00\\%$	$\\color{green}89/89$ $\\color{green}+100.00\\%$	$\\color{green}11/11$ $\\color{green}+100.00\\%$	$\\color{green}534/534$ $\\color{green}+100.00\\%$
random/strided/geometric	$\\color{green}181/181$ $\\color{green}+100.00\\%$	$\\color{green}3/3$ $\\color{green}+100.00\\%$	$\\color{green}0/0$ $\\color{green}+100.00\\%$	$\\color{green}181/181$ $\\color{green}+100.00\\%$

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