docs: update string interpolation in various stats/base/dists examples

[hrshya]

Resolves none .

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/dists/chi/cdf	$\color{red}277/279$ $\color{green}+99.28%$	$\color{red}23/24$ $\color{green}+95.83%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{red}277/279$ $\color{green}+99.28%$
stats/base/dists/chisquare/cdf	$\color{green}241/241$ $\color{green}+100.00%$	$\color{green}7/7$ $\color{green}+100.00%$	$\color{green}3/3$ $\color{green}+100.00%$	$\color{green}241/241$ $\color{green}+100.00%$
stats/base/dists/degenerate/cdf	$\color{green}261/261$ $\color{green}+100.00%$	$\color{green}19/19$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}261/261$ $\color{green}+100.00%$
stats/base/dists/degenerate/pdf	$\color{green}249/249$ $\color{green}+100.00%$	$\color{green}19/19$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}249/249$ $\color{green}+100.00%$
stats/base/dists/degenerate/pmf	$\color{green}247/247$ $\color{green}+100.00%$	$\color{green}19/19$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}247/247$ $\color{green}+100.00%$

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

[kgryte]

LGTM. Thanks @hrshya!