Manual Chapter 2 has incorrect examples

[ghost]

Issue description

The bullet points under Chapter 2, section 8 (the fdisk process) don't match up with what the real partitions are after write.

The last four lines of fdisk setup are relevant:

> x      # (enter expert mode)
> f      # (fix up the partition ordering)
> r      # (exit expert mode)
> w      # (write the partition table to disk and exit)

Earlier in the fdisk process, we create the partitions with the following numbering:

1. /
2. swap
3. /boot

I believe the fix partition ordering re-numbers the partitions based on their location within the partition label. Since the boot partition is at the front of the disk and our / partition is at the end, fdisk reorders the partitions as follows:

1. boot/
2. swap
3. /

The problem is when making the file systems. The manual still uses the initial partition numbers instead of the new, ordered numbers.

Thus:

# mkfs.ext4 -L nixos /dev/sda1

Creates an ext4 partition that is 512M big and is supposed to be boot. And:

# mkfs.fat -F 32 -n boot /dev/sda3

Creates a FAT32 partiton that's supposed to be our root labeled nixos.

Swap isn't affected being in the middle.

[samueldr]

Hi! Closing this issue since the partitioning instructions are now re-written for 18.09. (See #47697)

As far as the ordering of partitions is concerned, the newly re-written partitioning instructions were written to ensure it wouldn't be an issue.