Fix typo in Plane: "Represens" -> "Represents"

src/Maths/math.plane.ts

@@ -2,7 +2,7 @@ import { DeepImmutable } from '../types';
 import { Vector3, Matrix } from './math.vector';
 
 /**
- * Represens a plane by the equation ax + by + cz + d = 0
+ * Represents a plane by the equation ax + by + cz + d = 0
  */
 export class Plane {
     private static _TmpMatrix = Matrix.Identity();
@@ -205,4 +205,4 @@ export class Plane {
         var d = -(normal.x * origin.x + normal.y * origin.y + normal.z * origin.z);
         return Vector3.Dot(point, normal) + d;
     }
-}
+}