Improve hints

[blackk-foxx]

Improve the hints document to cover all three tasks:

• Task 1: a hint about Option.default
• Task 2: something about returning Some player or None
• Task 3: use a match expression covering the Some and None cases, and remove the mention of the max function since it does not pertain to the Options concept

[github-actions]

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[ErikSchierboom]

One tiny nit