docs(api): normalize generated file-path on Windows

[ngbrown]

When fixing #14017, and test-generating the markdown files I noticed that all the relative references to local files generated with the slashes swapped. I'm on Windows. This change replaces the "\" with "/" at the source of generating the relative path on path.relative() in the scripts/docs.ts file.

No changeset because this is documentation mechanics.

[changeset-bot]

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Latest commit: 7b540e1

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[brophdawg11]

Thanks!