Documentation: Suggest using genext2fs on macos

This is a nice alternative to dealing with fuse, and a step forward
towards not requiring root.

Documentation/BuildInstructions.md

@@ -114,10 +114,13 @@ Make sure you have all the dependencies installed:
 # core
 brew install coreutils qemu bash gcc@10 ninja cmake
 
-# Fuse + ext2
+# (option 1) fuse + ext2
 brew install e2fsprogs m4 autoconf automake libtool
 brew install --cask osxfuse
 Toolchain/BuildFuseExt2.sh
+
+# (option 2) genext2fs
+brew install genext2fs
 ```
 
 Notes: