loadFilterShader fixes

lib/empty-example/sketch.js

@@ -1,7 +1,7 @@
 function setup() {
- // put setup code here
-}
-
-function draw() {
-  // put drawing code here
-}
+  // put setup code here
+ }
+ 
+ function draw() {
+   // put drawing code here
+ }

src/webgl/material.js

@@ -533,7 +533,7 @@ function material(p5, fn){
    * let myShader;
    *
    * async function setup() {
-   *   myShader = await loadFilterShader('assets/shader.frag');
+   *   myShader = await loadFilterShader('assets/basic.frag');
    *   createCanvas(100, 100, WEBGL);
    *   noStroke();
    * }
@@ -543,15 +543,15 @@ function material(p5, fn){
    *   shader(myShader);
    *
    *   // rect gives us some geometry on the screen
-   *   rect(0, 0, width, height);
+   *   rect(-50, -50, width, height);
    * }
    * </code>
    * </div>
    * @alt
    * A rectangle with a shader applied to it.
    */
   fn.loadFilterShader = async function (fragFilename, successCallback, failureCallback) {
-    p5._validateParameters('loadFilterShader', arguments);
+    // p5._validateParameters('loadFilterShader', arguments);
     try {
       // Load the fragment shader
       const fragSrc = await this.loadStrings(fragFilename);