Update RaycastResult.yaml

[lack-of-gravity-jack]

Changes

Changed the references from "instance" to BasePart. Referring to the type of the intersected object as "instance" is too generic and may be confusing, since Models and Folders are also instances that some intersected object could have been a child of, but raycasts can only return a reference to the object in of itself and never the parent model. The (poorly named) instance property of RaycastResult can only ever hold a basepart or a terrain cell, and terrain descends from basepart so basepart is accurate and more specific than instance.

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