[Docs] Fix "Where does redwood load my environment variables?" code & link#11882

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Philzen wants to merge 3 commits intoredwoodjs:mainfrom Philzen:docs/fix-env-code-reference-and-improve-doc

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Commits on Jan 6, 2025

Fix "Where does redwood load my environment variables?" code & link
Philzen
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Commits on Jan 7, 2025

Prefer link to loadEnvFiles in @redwood/cli-helpers, anticipating redwoodjs#11885
Philzen
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Add doc section for --load-env-files CLI option
Philzen
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