Error in noise() example code in documentation

Issue description

Small error in example code, the example contains two void draw()s, instead of one void start() and one void draw(). Proposed fix is to modify the first void draw() to void setup(). This fix has been tested and the code is working after changing this.

URL(s) of affected page(s)

https://processing.org/reference/noise_.html

Proposed fix

...
void setup() { //this line got changed from void draw()
  background(204);
...
}
float noiseScale = 0.02;

void draw() {
  background(0);
...
}

打开 https://processing.org/reference/noise_.html 上受影响的 noise() 参考页面，并检查其中的示例代码。将第一个重复的 void draw() 声明改为 void setup()，然后验证示例包含一个 setup() 和一个 draw()，并且仍能按描述正常工作。