docs: Update particle docs

site/docs/12-other/13-particles.mdx

@@ -11,29 +11,74 @@ Particles can be used to generate dust, smoke, or fire effects in your games.
 The easiest way to create a [[ParticleEmitter]] is to use the
 [Particle Tester](https://excaliburjs.com/particle-tester/) to generate code for emitters.
 
+:::warning
+The particle tester constructor is currently out of date, you will need to modify it to match the below.
+:::
+
 ### Example: Adding an emitter
 
 ```js
 const actor = new ex.Actor(...);
-const emitter = new ex.ParticleEmitter(...);
-emitter.emitterType = ex.EmitterType.Circle; // Shape of emitter nozzle
-emitter.radius = 5;
-emitter.minVel = 100;
-emitter.maxVel = 200;
-emitter.minAngle = 0;
-emitter.maxAngle = Math.PI * 2;
-emitter.emitRate = 300; // 300 particles/second
-emitter.opacity = 0.5;
-emitter.fadeFlag = true; // fade particles overtime
-emitter.particleLife = 1000; // in milliseconds = 1 sec
-emitter.maxSize = 10; // in pixels
-emitter.minSize = 1;
-emitter.particleColor = ex.Color.Rose;
-// set emitter settings
-emitter.isEmitting = true;  // should the emitter be emitting
+const emitter = new ParticleEmitter({
+  x: 100,
+  y: 100,
+  radius: 5,
+  emitterType: ex.EmitterType.Circle, // Shape of emitter nozzle
+  minVel: 100,
+  maxVel: 200,
+  minAngle: 0,
+  maxAngle: Math.PI * 2,
+  isEmitting: true, // should the emitter be emitting
+  emitRate: 300, // 300 particles/second
+  opacity: 0.5,
+  fadeFlag: true, // fade particles overtime
+  particleLife: 1000, // in milliseconds = 1 sec
+  minSize: 1, // random size minimum in pixels
+  maxSize: 10, // random size maximum in pixels
+  startSize: 10, // starting size in pixels
+  endSize: 1, // ending size in pixels
+  acceleration: new Vector(accelX, accelY),
+  beginColor: ex.Color.Red,
+  endColor: ex.Color.Blue,
+  focusAccel: 800
+});
 // add the emitter as a child actor, it will draw on top of the parent actor
 // and move with the parent
 actor.add(emitter);
 // or, alternatively, add it to the current scene
 engine.add(emitter);
 ```
+
+### 🧪 Alpha Particle Emitter
+
+In the latest build particle specific properties are nested under the `particle` config
+
+```typescript
+const emitter = new ParticleEmitter({
+  x: game.halfDrawWidth,
+  y: game.halfDrawHeight,
+  width,
+  height,
+  emitterType,
+  radius,
+  isEmitting,
+  emitRate,
+  focusAccel: 800,
+  particle: {
+    minVel,
+    maxVel,
+    minAngle,
+    maxAngle,
+    opacity,
+    fade,
+    life,
+    minSize,
+    maxSize,
+    startSize,
+    endSize,
+    acc: new Vector(accelX, accelY),
+    beginColor: ex.Color.Red,
+    endColor: ex.Color.Blue,
+  }
+});
+```