Update Renderer.js

Fix JSDoc.

src/renderers/common/Renderer.js

@@ -560,8 +560,7 @@ class Renderer {
 		 * and pipeline updates.
 		 *
 		 * @private
-		 * @type {?Function}
-		 * @default null
+		 * @type {Function}
 		 */
 		this._handleObjectFunction = this._renderObjectDirect;