Seeming mistake in DESeq2 dispersion definition

[sam-israel]

https://github.com/hbctraining/DGE_workshop/blob/master/lessons/04_DGE_DESeq2_analysis.md

says

" For genes with moderate to high count values, the square root of dispersion will be equal to the coefficient of variation (Var / μ) "
Whereas it should be SD / μ.

(Judging by the formula Var = μ + α*μ^2)