Alpine: Use ZFS for /boot, updated bootloader instructions

Signed-off-by: Maurice Zhou <ja@apvc.uk>

docs/Getting Started/Alpine Linux/Root on ZFS/1-preparation.rst

@@ -36,8 +36,21 @@ Preparation
 
     ssh root@192.168.1.19
 
+#. Configure NTP client for time synchronization::
+
+     setup-ntp chrony
+
+#. Pick a mirror from `Alpine Mirrors <https://mirrors.alpinelinux.org/>`__
+   and add it to package manager configuration::
+
+     tee -a /etc/apk/repositories <<EOF
+     https://dl-5.alpinelinux.org/alpine/latest-stable/community/
+     https://dl-5.alpinelinux.org/alpine/latest-stable/main/
+     EOF
+
 #. Throughout this guide, we use predictable disk names generated by udev::
 
+     apk update
      apk add eudev
      setup-udev
 
@@ -59,21 +72,8 @@ Preparation
 
     DISK='/dev/disk/by-id/disk1'
 
-#. Configure NTP client for time synchronization::
-
-     setup-ntp chrony
-
-#. Pick a mirror from `Alpine Mirrors <https://mirrors.alpinelinux.org/>`__
-   and add it to package manager configuration::
-
-     tee -a /etc/apk/repositories <<EOF
-     https://dl-5.alpinelinux.org/alpine/latest-stable/community/
-     https://dl-5.alpinelinux.org/alpine/latest-stable/main/
-     EOF
-
 #. Install ZFS support and partition tool::
 
-    apk update
     apk add zfs zfs-lts sgdisk e2fsprogs
     modprobe zfs