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
math/base/special/acotd	$\color{green}178/178$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}178/178$ $\color{green}+100.00\%$
stats/base/dists/rayleigh/kurtosis	$\color{green}175/175$ $\color{green}+100.00\%$	$\color{green}8/8$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}175/175$ $\color{green}+100.00\%$
stats/base/svariancewd	$\color{green}452/452$ $\color{green}+100.00\%$	$\color{green}21/21$ $\color{green}+100.00\%$	$\color{green}4/4$ $\color{green}+100.00\%$	$\color{green}452/452$ $\color{green}+100.00\%$

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