Docs: mistake in "Importance sampling for the IBL" section

[htlpt]

Describe the bug
Mistake in the Jacobian of transform between distributions (missing a reciprocal）

Maybe a terminology problem ?

To Reproduce
Steps to reproduce the behavior:

1. Go to 9.2 Importance sampling for the IBL
2. equation 126, 127

Screenshots

Expected behavior
Eq.126 :

Eq.127:

Additional context
some references:

[1] Physically Based Rendering, Third Edition 13.5.1

[2] Microfacet Models for Refraction through Rough Surfaces, EGSR 2007

Jacobian of transformation from l->h is shown, h->l should be the reciprocal

[htlpt]

also in 5.3.4.2.2 "Discrete Domain", the pdf is missing a "4"

[romainguy]

Thanks, those look like omissions/typos indeed.