docs: update Markdown equation elements

[stdlib-bot]

This PR

• updates equation elements found in Markdown files

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/bradford/cdf	$\\color{green}299/299$ $\\color{green}+100.00\\%$	$\\color{green}25/25$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}299/299$ $\\color{green}+100.00\\%$
stats/base/dists/bradford/median	$\\color{green}181/181$ $\\color{green}+100.00\\%$	$\\color{green}8/8$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}181/181$ $\\color{green}+100.00\\%$
stats/base/dists/bradford/mode	$\\color{green}177/177$ $\\color{green}+100.00\\%$	$\\color{green}8/8$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}177/177$ $\\color{green}+100.00\\%$
stats/base/dists/bradford/pdf	$\\color{green}297/297$ $\\color{green}+100.00\\%$	$\\color{green}23/23$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}297/297$ $\\color{green}+100.00\\%$
stats/base/dists/bradford/quantile	$\\color{green}290/290$ $\\color{green}+100.00\\%$	$\\color{green}21/21$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}290/290$ $\\color{green}+100.00\\%$
stats/base/dists/normal/mean	$\\color{green}175/175$ $\\color{green}+100.00\\%$	$\\color{green}9/9$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}175/175$ $\\color{green}+100.00\\%$
stats/base/dists/t/logcdf	$\\color{green}309/309$ $\\color{green}+100.00\\%$	$\\color{green}31/31$ $\\color{green}+100.00\\%$	$\\color{green}4/4$ $\\color{green}+100.00\\%$	$\\color{green}309/309$ $\\color{green}+100.00\\%$

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