fixing doc error

src/babylon.scene.ts

@@ -4230,10 +4230,11 @@
         }
 
         // Octrees
+
         /**
          * Get the world extend vectors with an optional filter
          * 
-         * @param {(mesh: AbstractMesh) => boolean} [filterPredicate] the predicate - which meshes should be included when calculating the world size
+         * @param filterPredicate the predicate - which meshes should be included when calculating the world size
          * @returns {{ min: Vector3; max: Vector3 }} min and max vectors
          */
         public getWorldExtends(filterPredicate?: (mesh: AbstractMesh) => boolean): { min: Vector3; max: Vector3 } {