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/negative-binomial	$\color{green}212/212$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}0/0$ $\color{green}+100.00%$	$\color{green}212/212$ $\color{green}+100.00%$
random/array/triangular	$\color{green}215/215$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}0/0$ $\color{green}+100.00%$	$\color{green}215/215$ $\color{green}+100.00%$
random/base/erlang	$\color{green}512/512$ $\color{green}+100.00%$	$\color{green}56/56$ $\color{green}+100.00%$	$\color{green}12/12$ $\color{green}+100.00%$	$\color{green}512/512$ $\color{green}+100.00%$
random/base/frechet	$\color{green}507/507$ $\color{green}+100.00%$	$\color{green}61/61$ $\color{green}+100.00%$	$\color{green}12/12$ $\color{green}+100.00%$	$\color{green}507/507$ $\color{green}+100.00%$
random/geometric	$\color{green}215/215$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}0/0$ $\color{green}+100.00%$	$\color{green}215/215$ $\color{green}+100.00%$
random/strided/gamma	$\color{green}295/295$ $\color{green}+100.00%$	$\color{green}19/19$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}295/295$ $\color{green}+100.00%$
random/strided/lognormal	$\color{green}295/295$ $\color{green}+100.00%$	$\color{green}19/19$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}295/295$ $\color{green}+100.00%$

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