chore: aligned docs to the template file for articles

knowledge base/funtoo linux.md

@@ -1,5 +1,12 @@
 # Funtoo GNU/Linux
 
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+
+## TL;DR
+
 ```sh
 # Portage update.
 sudo ego sync
@@ -9,9 +16,18 @@ sudo emerge --sync
 ## Further readings
 
 - [Installation] guide
+- [Gentoo Linux]
 - [Portage]
 - [Profiles]
 
+<!--
+  References
+  -->
+
+<!-- Upstream -->
 [installation]: https://www.funtoo.org/Install
-[portage]: portage.md
 [profiles]: https://www.funtoo.org/Funtoo_Profiles
+
+<!-- Knowledge base -->
+[gentoo linux]: gentoo%20linux.md
+[portage]: portage.md