Fix codebox format

[MrMystery10-del]

Pretty much all codeboxes in 'src/boxed_primitives' are not formatted correctly.

Instead of:

void main() {
     Boolean b = null;
     System.out.println(b);
     b = true;
     System.out.println(true);
}

They are formatted without the tab before new line in method body:

void main() {
Boolean b = null;
System.out.println(b);
b = true;
System.out.println(true);
}

This is just ugly and bad for readability.

[MrMystery10-del]

Opened pull-request for this: #40

[bowbahdoe]

This is intentional. Closing with #40