Easy one here, and not high priority, but still important I would think:
In “Archviz Interior Rendering” page, under “Samples and Tutorials > Engine Feature Examples”, there’s a typo of the label of the ray tracing quality switch replace node. The label of the actual node is, I think, “RayTracingQualitySwitchReplace”, while this page has two instances of it typed as “RayTracingQualityReplaceSwitch” in the following location: