Overloaded notation in description of Gradient Boosting?

[ricj]

Location
Please provide:

1. Version: Online draft version July 8, 2022
2. Page number: 186, Method 7.3
3. Line/equation number: 4-6

Describe the mistake
The notation f^(b) seems to be overloaded: it seems to refer to both the ensemble as a whole, and to an individual regression model.

Suggested change
Use separate notation for the ensemble and individual models.

Additional comments