Make editorial changes following GP's comments.

[drvinceknight]

Tests are failing in chapter 8 (LP) with python:

Testing src/chapters/08/main.tex
65
python: ❌ Input does not match output in src/chapters/08/main.tex
66
Obtained output:
67
Y_3
68
X_2_5
69
0.0
70
1.0
71
Day 0: 1, 12, 
72
Day 5: 0, 13, 
73
Day 6: 11, 
74
Day 7: 4, 6, 10, 
75
Day 8: 3, 5, 9, 
76
Day 9: 2, 7, 
77
Day 13: 8,
78
Expected output:
79
Y_3
80
X_2_5
81
0.0
82
1.0
83
Day 0: 1, 12, 
84
Day 3: 5, 9, 
...