[Docs] Fix example code in quantum_painter.md (#24897)

https://github.com/qmk/qmk_firmware/issues/24896

docs/quantum_painter.md

@@ -884,7 +884,7 @@ static painter_image_handle_t my_image;
 void keyboard_post_init_kb(void) {
     my_image = qp_load_image_mem(gfx_my_image);
     if (my_image != NULL) {
-        qp_drawimage(display, (239 - my_image->width), (319 - my_image->height), my_image);
+        qp_drawimage(display, (240 - my_image->width), (320 - my_image->height), my_image);
     }
 }
 ```
@@ -909,7 +909,7 @@ static deferred_token my_anim;
 void keyboard_post_init_kb(void) {
     my_image = qp_load_image_mem(gfx_my_image);
     if (my_image != NULL) {
-        my_anim = qp_animate(display, (239 - my_image->width), (319 - my_image->height), my_image);
+        my_anim = qp_animate(display, (240 - my_image->width), (320 - my_image->height), my_image);
     }
 }
 ```
@@ -1001,7 +1001,7 @@ void keyboard_post_init_kb(void) {
     if (my_font != NULL) {
         static const char *text = "Hello from QMK!";
         int16_t width = qp_textwidth(my_font, text);
-        qp_drawtext(display, (239 - width), (319 - my_font->line_height), my_font, text);
+        qp_drawtext(display, (240 - width), (320 - my_font->line_height), my_font, text);
     }
 }
 ```