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/ln-ten	$\color{green}55/55$ $\color{green}+100.00\%$	$\color{green}1/1$ $\color{green}+100.00\%$	$\color{green}0/0$ $\color{green}+100.00\%$	$\color{green}55/55$ $\color{green}+100.00\%$
math/strided/special/atanh-by	$\color{green}197/197$ $\color{green}+100.00\%$	$\color{green}5/5$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}197/197$ $\color{green}+100.00\%$
ndarray/index	$\color{green}1038/1038$ $\color{green}+100.00\%$	$\color{green}94/94$ $\color{green}+100.00\%$	$\color{green}17/17$ $\color{green}+100.00\%$	$\color{green}1038/1038$ $\color{green}+100.00\%$
slice/base/normalize-multi-slice	$\color{green}221/221$ $\color{green}+100.00\%$	$\color{green}12/12$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}221/221$ $\color{green}+100.00\%$

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