Remove lock LED example in quantum.c (#5636)

* Use GPIO helper defines in backlighting

* While I'm here, fix up the lock LED example too

* Remove the example altogether, it's already documented

quantum/quantum.c

@@ -1384,23 +1384,6 @@ void led_init_ports(void)
 __attribute__ ((weak))
 void led_set(uint8_t usb_led)
 {
-
-  // Example LED Code
-  //
-    // // Using PE6 Caps Lock LED
-    // if (usb_led & (1<<USB_LED_CAPS_LOCK))
-    // {
-    //     // Output high.
-    //     DDRE |= (1<<6);
-    //     PORTE |= (1<<6);
-    // }
-    // else
-    // {
-    //     // Output low.
-    //     DDRE &= ~(1<<6);
-    //     PORTE &= ~(1<<6);
-    // }
-
 #if defined(BACKLIGHT_CAPS_LOCK) && defined(BACKLIGHT_ENABLE)
   // Use backlight as Caps Lock indicator
   uint8_t bl_toggle_lvl = 0;