Minor whitespace changes

[randomPoison]

• Add extra lines in a couple places to make code examples more readable. In both these cases I'm trying to break the code into more logical groups, generally some statement followed by a println showing the result of that operation.
• Split the first example of struct initialization across a couple of lines for readability. I personally struggle to read that statement when it's all one line, so I expect it'd be hard for students, and I always break it up like this in class.

[randomPoison]

oh wait, this formatting is enforced by the formatter. How do I tell it to ignore this block?

[randomPoison]

Ah, found it