Fix predictor.fit diagram

Module 1. The Predictive Modeling Pipeline Fitting a scikit-learn model on numerical data
#1

Second demo notebook:

58

Typos, Phrasing & Other formal remarks (Module 1)
#2

I moved this from another topic and removed the parts that I already fixed.

Typos, Phrasing & Other formal remarks (Module 1)
#3

Should be fixed now.

#4