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
constants/float32/fourth-pi	$\color{green}52/52$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}52/52$ $\color{green}+100.00\%$
constants/float32/ln-half	$\color{green}55/55$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}55/55$ $\color{green}+100.00\%$
constants/float32/max-safe-nth-lucas	$\color{green}51/51$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}51/51$ $\color{green}+100.00\%$
constants/float64/high-word-sign-mask	$\color{green}56/56$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}56/56$ $\color{green}+100.00\%$
math/base/special/csch	$\color{green}164/164$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}164/164$ $\color{green}+100.00\%$

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