Mistakenly labelled equation on page 385

[mgrabovsky]

In the paragraph following equation 20.2 on p. 385, we can read

Equating the coefficients of z in (20.1) and (20.2) yields β₂* = β₁ + β₂γ₁.

However, there's no β₂* in equation 20.1. I believe the second equation in the subsection (the one with starred β's) should be marked as (20.1).

[avehtari]

Thanks! Fixed for the future printings and added to the errata.