feat(godot): Clarify environment option default

[limbonaut]

DESCRIBE YOUR PR

Clarify environment option default in the Godot SDK, according to changes in:

• feat: Add environment option to project settings sentry-godot#469

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Project	Deployment	Review	Updated (UTC)
sentry-docs	Ready	Preview, Comment	Dec 22, 2025 2:00pm

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
develop-docs	Ignored		Dec 22, 2025 2:00pm