Fixed example broken by #6216 and added information for new camera default setting

[inaridarkfox4231]

Due to #6216, many reference examples related to cameras were broken. The purpose is to restore it to its original state.

Resolves #6611

Changes: many.

Screenshots of the change:

before

function setup() {
  createCanvas(100, 100, WEBGL);
  perspective(PI/3, 1, 5*sqrt(3), 500*sqrt(3));
  describe('a square moving closer and then away from the camera.');
}
function draw() {
  background(204);
  //move the camera away from the plane by a sin wave
  camera(0, 0, 20 + sin(frameCount * 0.01) * 10, 0, 0, 0, 0, 1, 0);
  plane(10, 10);
}

after

PR Checklist

• npm run lint passes
• Inline documentation is included / updated
• Unit tests are included / updated

[inaridarkfox4231]

Please leave a review.

[davepagurek]

Thanks for combing through all the examples!