docs(wokwi-leds): explain the fps attribute

Author: urish

docs/parts/wokwi-led.md

@@ -23,6 +23,7 @@ Standard 5mm LED.
 | label      | Text that appears below the led |                      |
 | gamma      | Gamma correction factor         | "2.8"                |
 | flip       | Flips the led horizontally      | ""                   |
+| fps        | The framerate of the LED        | "80"                 |
 
 Note: To rotate LEDs, click on them and press "R", or set the ["rotate" property](../diagram-format#parts).
 
@@ -52,6 +53,14 @@ The [Gamma Correction Demo project](https://wokwi.com/projects/30476298871006880
 
 For more information about _gamma correction_, including some code examples, check out this [great guide from Adafruit](https://learn.adafruit.com/led-tricks-gamma-correction).
 
+### FPS
+
+The `fps` attribute controls the framerate of the LED, that is how often the LED brightness is updated. The default value is 80.
+
+If you are using PWM (`analogWrite()`) and noticing flickering, try setting a smaller the `fps` value.
+
+In case you are experiencing LED light ghosting, you can try increasing the `fps` value. For example, this [rotating cube](https://wokwi.com/projects/355020415991153665) uses an `fps` value of 10000 to update the LEDs at a higher rate and avoid ghosting of the rotating cube.
+
 ## Simulator examples
 
 - [Blink](https://wokwi.com/projects/344891652101374548) - Arduino's standard Blink sketch