fix: Correct fibonacci set definition and enhance postres examples

[taicoding]

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[Copilot]

Pull request overview

This PR updates the sets lesson examples, adjusting the Fibonacci mini-test data and expanding dessert set method examples.

Changes:

• Updates the fibonacci set literal in the mini-test.
• Adds an additional dessert add() example before the union example.
• Adds a clarifying comment for the helados set.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
02_estructuras_de_datos/02_conjuntos/mini_test.py	Adjusts the Fibonacci set used in the set operation mini-test.
02_estructuras_de_datos/02_conjuntos/metodos.py	Adds another dessert set setup/add example before union operations.

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