docs(known-instances): add Arch wiki

Signed-off-by: Xe Iaso <me@xeiaso.net>

docs/docs/user/known-instances.md

@@ -4,31 +4,32 @@ title: List of known websites using Anubis
 
 This page contains a non-exhaustive list with all websites using Anubis.
 
-* <details>
+- <details>
   <summary>The Linux Foundation</summary>
-  
-  * https://git.kernel.org/
-  * https://lore.kernel.org/
+  - https://git.kernel.org/
+  - https://lore.kernel.org/
   </details>
-  * https://gitlab.gnome.org/
-  * https://scioly.org/
-  * https://bugs.winehq.org/
-  * https://svnweb.freebsd.org/
-  * https://trac.ffmpeg.org/
-  * https://git.sr.ht/
-  * https://xeiaso.net/
-  * https://source.puri.sm/
-  * https://git.enlightenment.org/
-  * https://superlove.sayitditto.net/
-  * https://linktaco.com/
-  * https://jaredallard.dev/
-  * https://dev.sanctum.geek.nz/
-  * https://canine.tools/
-  * https://git.lupancham.net/
-  * https://dev.haiku-os.org
-  * http://code.hackerspace.pl/
-* <details>
+- https://gitlab.gnome.org/
+- https://scioly.org/
+- https://bugs.winehq.org/
+- https://svnweb.freebsd.org/
+- https://trac.ffmpeg.org/
+- https://git.sr.ht/
+- https://xeiaso.net/
+- https://source.puri.sm/
+- https://git.enlightenment.org/
+- https://superlove.sayitditto.net/
+- https://linktaco.com/
+- https://jaredallard.dev/
+- https://dev.sanctum.geek.nz/
+- https://canine.tools/
+- https://git.lupancham.net/
+- https://dev.haiku-os.org
+- http://code.hackerspace.pl/
+- https://wiki.archlinux.org/
+
+- <details>
   <summary>The United Nations</summary>
 
-  * https://policytoolbox.iiep.unesco.org/
+  - https://policytoolbox.iiep.unesco.org/
   </details>