docs(arduino): add note to not use lv_examles library

fixes #4054

docs/get-started/platforms/arduino.md

@@ -52,9 +52,14 @@ In the INO file you can see how to register a display and a touchpad for LVGL an
 
 Note that, there is no dedicated INO file for every example. Instead, you can load an example by calling an `lv_example_...` function. For example `lv_example_btn_1()`.
 
-**IMPORTANT**
+**IMPORTANT NOTE 1**
 Due to some the limitations of Arduino's build system you need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.
 
+
+**IMPORTANT NOTE 2**
+Note that the `lv_examples` library is for LVGL v7 and you shouldn't install it for this version (since LVGL v8)
+as the examples and demos are now part of the main LVGL library.
+
 ## Debugging and logging
 
 LVGL can display debug information in case of trouble.

examples/arduino/LVGL_Arduino/LVGL_Arduino.ino

@@ -1,13 +1,13 @@
 /*Using LVGL with Arduino requires some extra steps:
- * Be sure to read the docs here: https://docs.lvgl.io/master/get-started/platforms/arduino.html  */
+ *Be sure to read the docs here: https://docs.lvgl.io/master/get-started/platforms/arduino.html  */
 
 #include <lvgl.h>
 #include <TFT_eSPI.h>
 
 /*To use the built-in examples and demos of LVGL uncomment the includes below respectively.
- *You also need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.*/
-//#include <demos/lv_demos.h>
-//#include <examples/lv_examples.h>
+ *You also need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.
+ Note that the `lv_examples` library is for LVGL v7 and you shouldn't install it for this version (since LVGL v8)
+ as the examples and demos are now part of the main LVGL library. */
 
 /*Change to your screen resolution*/
 static const uint16_t screenWidth  = 480;