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docs: updated code examples for flappy bird tutorial (#3628)

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Relates to https://github.com/excaliburjs/Excalibur/issues/3627

## Changes:

Updated flappy bird tutorial with a note regarding expected behavior of bug when the bird dies.

Updated flappy bird tutorial code snippets to include a few missing imports.

Documentation Updates:

Step 4 of flappy bird tutorial (https://excaliburjs.com/docs/step-4-flying-bird)

Before
<img width="1382" height="748" alt="Screenshot 2025-12-19 at 12 24 33 PM" src="https://github.com/user-attachments/assets/2c2... (continued)

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