fix: intro-to-js week-1 session exercises - small adjustments

[shpomp]

Change # 1:

before

const name = "benjamin";
name = "benjamin-better";

const pizzaPrice = 78;
const pizzaPriceDiscounted = pizzaprice - 10;

const users = ["peter", "Johnny", "Børge"];

const lastUser = users[3];

after

...

const lastUser = users[3];
console.log(lastUser);

Without the console.log, it is not obvious that something is wrong with the const lastUser = users[3];.

EDIT:

Change # 2:

Pizza exercise adjustment suggested by @vdaguenet, resolves #223. 🍕

[vdaguenet]

Agreed! No one noticed the issue on lastUser today.

[adamblanchard]

Looks good, thanks both!