Added tags for `.castShadow`

src/lights/HemisphereLight.d.ts

@@ -26,7 +26,9 @@ export class HemisphereLight extends Light {
 	position: Vector3;
 
 	/**
-	 * @default undefined
+	 * This light cannot be used to cast shadows.
+	 * @default false
+	 * @override
 	 */
 	castShadow: boolean;