Update MeshToonMaterial.js

Fix JSDoc for `gradientMap`.

src/materials/MeshToonMaterial.js

@@ -57,7 +57,7 @@ class MeshToonMaterial extends Material {
 
 		/**
 		 * Gradient map for toon shading. It's required to set
-		 * {@link Texture#minFilter} and {@link Texture#magFilter} to {@linkNearestFilter}
+		 * {@link Texture#minFilter} and {@link Texture#magFilter} to {@link NearestFilter}
 		 * when using this type of texture.
 		 *
 		 * @type {?Texture}