Add `errors` property to description of `constructRoutes` function's `layoutData` argument

[SevenOutman]

• Mention errors in description of constructRoutes function's layoutData argument
• Fix url of link to loaders docs

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Latest commit: 9805f0fc5af325998380896184dba4f9357244f4

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[MilanKovacic]

Hi, thank you for the PR. Could you please adapt it since v6 of the documentation has been released?