[v6]: add docs for entryType in Adapter API

[ArmandPhilippot]

Description (required)

Adds docs for entryType, a new property added to setAdapter() in withastro/astro#14306

The second added property (devEntrypoint) is now removed, see withastro/astro#15005

Related issues & labels (optional)

• Suggested label: v6, add new content

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[sarah11918]

Thanks so much for finding and documenting this!