Correction to Arch Linux guide

Added 32 bit and 64 bit installer for Arch Linux

README.md

@@ -157,19 +157,30 @@ If you are building it by yourself, you need to enable multilib repository, by e
 sudo nano /etc/pacman.conf
 ```
 
-and uncomment:
+and uncomment the lines in order to look like this:
 
-```txt
-#[multilib]
-#Include = /etc/pacman.d/mirrorlist
+```ini
+[multilib]
+Include = /etc/pacman.d/mirrorlist
 ```
 
-then save the file and execute:
+then save the file and execute the command to refresh databases:
 
 ```
 sudo pacman -Syy
 ```
 
+and install the 64 bit package with:
+
+```
+sudo pacman -S mangohud
+```
+
+For 32 bit package, install with:
+```
+sudo pacman -S lib32-mangohud
+```
+
 ### Debian, Ubuntu
 
 If you are using Debian 11 (Bullseye) or later, Ubuntu 21.10 (Impish) or later, or distro derived from them, to install the [MangoHud](https://tracker.debian.org/pkg/mangohud) package, execute: