Documentation: libjaylink now available on Arch

https://archlinux.org/packages/extra/x86_64/libjaylink/

Test: Builds on Artix.

Change-Id: Ie8a19e547798dec4a96e6a50fe2f6cbd09fba190
Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/86
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/Documentation/building_meson.md b/Documentation/building_meson.md
index e0c39a0..17f8882 100644
--- a/Documentation/building_meson.md
+++ b/Documentation/building_meson.md
@@ -51,10 +51,9 @@
 ```
 
 ### ArchLinux / Manjaro
-  * __libjaylink__ is not available through the package manager
 ```
 pacman -S --noconfirm gcc meson ninja pkg-config \
-	pciutils libusb libftdi libgpiod
+	pciutils libusb libftdi libgpiod libjaylink
 ```
 
 ### NixOS / Nixpkgs