site/_index.md: Fix JEP 401 link

[jcsahnwaldt]

typo: link should point to 401, not 390

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• Change must not contain extraneous whitespace

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@jcsahnwaldt This change now passes all automated pre-integration checks.

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site/_index.md: Fix JEP 401 link

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[jcsahnwaldt]

/integrate

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@jcsahnwaldt
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