installation/guides/arm-devices/apple-silicon: fix link, mention efi

Author: dkwo

src/installation/guides/arm-devices/apple-silicon.md

@@ -2,7 +2,7 @@
 
 Void's Apple Silicon support is based on Asahi Linux. See their
 [website](https://asahilinux.org) and
-[documentation](https://github.com/AsahiLinux/docs/wiki) for more information.
+[documentation](https://asahilinux.org/docs) for more information.
 
 ## Installation
 
@@ -14,6 +14,12 @@ macos $ curl https://alx.sh > alx.sh
 macos $ sh ./alx.sh
 ```
 
+When selecting the minimal UEFI environment installation option, the
+Asahi Installer can be directed to create free space for a future root
+filesystem. You must use this facility to prepare your disk for Void
+Linux, rather than attempting to manually shrink or alter APFS containers
+via Void Installer.
+
 Then, [create a Live USB](../../live-images/prep.md) using an [Apple Silicon
 Void Linux ISO](https://voidlinux.org/download/#arm%20platforms). U-Boot
 (installed by the Asahi installer) should show the external USB as a boot
@@ -28,9 +34,14 @@ U-Boot> boot
 To install, follow the [chroot install guide](../chroot.md), using the "XBPS
 method", observing the following modifications:
 
-For the base installation, install `base-system`, `asahi-base`, and
-`asahi-scripts`. These packages provide important configurations and install the
-necessary dependencies. When running `grub-install`, add the `--removable` flag.
+Do not alter the partition table.  It is not safe to alter or rearrange
+any disk structure other than the free space left by Asahi Installer.
+For our purposes, the EFI System Partition is the one created by Asahi
+Linux install script, and it should be mounted at `/mnt/boot/efi`.
+
+For the base installation, install `base-system` and `asahi-base`. This
+package provides important configurations and installs the necessary
+dependencies.  When running `grub-install`, add the `--removable` flag.
 
 To use another bootloader with `m1n1`, ensure it installs the bootloader EFI
 executable at `EFI/BOOT/BOOTAA64.EFI` within the EFI system partition. `m1n1`