Fixed line typings

examples/jsm/lines/Line2.d.ts

@@ -4,8 +4,8 @@ import { LineMaterial } from './LineMaterial';
 
 export class Line2 extends LineSegments2 {
 
-	geometry?: LineGeometry;
-	material?: LineMaterial;
+	geometry: LineGeometry;
+	material: LineMaterial;
 
 	constructor( geometry?: LineGeometry, material?: LineMaterial );
 	readonly isLine2: true;

examples/jsm/lines/LineSegments2.d.ts

@@ -7,6 +7,9 @@ import { LineSegmentsGeometry } from './LineSegmentsGeometry';
 
 export class LineSegments2 extends Mesh {
 
+	geometry: LineSegmentsGeometry;
+	material: LineMaterial;
+
 	constructor( geometry?: LineSegmentsGeometry, material?: LineMaterial );
 	readonly isLineSegments2: true;