Remove outdated instruction

pkg/arch/README.md

@@ -1,22 +1,11 @@
 # Arch Linux PKGBUILDs for Surface Linux
 
-Primarily tested on Arch Linux + Surface Laptop 13" (Intel).
-
 ## Instructions
 
-- Building the patched kernel (includes ACPI module)
+- Building the patched kernel
   ```
   cd kernel
   PKGEXT=".pkg.tar" MAKEFLAGS="-j8" makepkg -s --skippgpcheck
   sudo pacman -U linux-surface-*.pkg.tar
   ```
   It's based on the Arch kernel tree (with patches curated by Arch developers) and Surface specific patches.
-
-- Building firmware:
-  Please refer to https://github.com/linux-surface/surface-ipts-firmware
-
-### Advanced users / testers
-
-- Building the ACPI module as a DKMS package (won't work with secure boot):
-  Please refer to https://github.com/linux-surface/surface-aggregator-module
-