This commit makes a minor change in the wording of the description of the errors2 exercise to avoid potential confusion, changing:
"A player of the game will type in how many items they want to buy, and the `total_cost` function will calculate the total cost of the tokens."
to
"A player of the game will type in how many items they want to buy, and the `total_cost` function will calculate the total cost of the items."
Hints are now accessible using the CLI subcommand `rustlings hint
<exercise name`.
BREAKING CHANGE: This fundamentally changes the way people interact with exercises.
