docs: add correct `pacman` command (#27486)

The `pacman` command in order to install packages on Arch in the documentation is invalid.
This PR fixes the command.

diff --git a/docs/HACKING.md b/docs/HACKING.md
index d5c53734300145f31536fd07987708ea203053b6..3af58f6b27f1fc471118cd05ecee99056d01e05d 100644 (file)
--- a/docs/HACKING.md
+++ b/docs/HACKING.md
@@ -72,7 +72,7 @@ $ sudo dnf builddep systemd
 # Debian/Ubuntu
 $ sudo apt-get build-dep systemd
 # Arch
-$ sudo pacman install asp
+$ sudo pacman -S asp
 $ asp checkout systemd
 $ cd systemd/trunk
 $ makepkg -seoc