Docs: Buffergeometry clarify normal attribute

See #12559

docs/api/core/BufferGeometry.html

@@ -73,7 +73,7 @@
 
 		<h3>[page:BufferAttribute normal] (itemSize: 3)</h3>
 		<div>
-		Stores the x, y, and z components of the face or vertex normal vector of each vertex in this geometry.
+		Stores the x, y, and z components of the vertex normal vector of each vertex in this geometry.
 		Set by [page:.fromGeometry]().
 		</div>