docs(deploy): GRUB's configuration read as root

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

deploy/host/README.md

@@ -58,7 +58,7 @@ for the later.
    sudo install -m 644 deploy/host/grub-halkyon.cfg /etc/default/grub.d/halkyon.cfg
    sudo install -m 755 deploy/host/grub-dracut-fallback /etc/grub.d/41_dracut_fallback
    sudo update-grub                     # "Found the way back: … with dracut's image"
-   grep -c 'the way back' /boot/grub/grub.cfg   # 1
+   sudo grep -c 'the way back' /boot/grub/grub.cfg   # 1 (root alone reads it)
    ```
 
    Then initramfs-tools, with what opens the root disk (`cryptsetup-initramfs`) and