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
math/base/special/exp10f	$\\color{red}298/300$ $\\color{green}+99.33\\%$	$\\color{red}15/16$ $\\color{green}+93.75\\%$	$\\color{green}3/3$ $\\color{green}+100.00\\%$	$\\color{red}298/300$ $\\color{green}+99.33\\%$
math/base/special/fast/acoshf	$\\color{green}169/169$ $\\color{green}+100.00\\%$	$\\color{green}10/10$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}169/169$ $\\color{green}+100.00\\%$
stats/incr/nancv	$\\color{green}141/141$ $\\color{green}+100.00\\%$	$\\color{green}11/11$ $\\color{green}+100.00\\%$	$\\color{green}2/2$ $\\color{green}+100.00\\%$	$\\color{green}141/141$ $\\color{green}+100.00\\%$

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