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
ndarray/matrix/ctor	$\\color{green}1296/1296$ $\\color{green}+100.00\\%$	$\\color{green}255/255$ $\\color{green}+100.00\\%$	$\\color{green}7/7$ $\\color{green}+100.00\\%$	$\\color{green}1296/1296$ $\\color{green}+100.00\\%$
ndarray/matrix/int32	$\\color{green}253/253$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}0/0$ $\\color{green}+100.00\\%$	$\\color{green}253/253$ $\\color{green}+100.00\\%$

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