ntrboot: move boot.3dsx copy step to section 4

There's really no need to touch anything from the Luma3DS package
during the ntrboot step; it does nothing while having SB9SI as
boot.firm anyway.

Thus, move it down to section 4 and align the wording with other pages.

_pages/en_US/installing-boot9strap-(ntrboot).txt

@@ -25,7 +25,6 @@ To use the [magnet](https://wikipedia.org/wiki/Magnet_URI_scheme) links on this
     + This is the SD card from your 3DS, *not* the SD card from your flashcart
 1. Copy `SafeB9SInstaller.firm` from the SafeB9SInstaller `.zip` to the root of your SD card and rename it to `boot.firm`
     + The root of the SD card refers to the initial directory on your SD card where you can see the Nintendo 3DS folder, but are not inside of it
-1. Copy `boot.3dsx` from the Luma3DS `.zip` to the root of your console's SD card
 1. Create a folder named `boot9strap` on the root of your console's SD card
 1. Copy `boot9strap.firm` and `boot9strap.firm.sha` from the boot9strap `.zip` to the `/boot9strap/` folder on your console's SD card
 
@@ -57,7 +56,7 @@ To use the [magnet](https://wikipedia.org/wiki/Magnet_URI_scheme) links on this
 
 1. Insert your console's SD card into your computer
 1. Delete `boot.firm` from the root of your SD card
-1. Copy `boot.firm` from the Luma3DS `.zip` to the root of your SD card
+1. Copy `boot.firm` and `boot.3dsx` from the Luma3DS `.zip` to the root of your SD card
 1. Reinsert your SD card into your console
 1. Power on your console
 {% include_relative include/configure-luma3ds.txt %}