chore: aligned docs to the template file for articles

knowledge base/authenticate without using sudo.md

@@ -1,8 +1,14 @@
 # Authenticate without using sudo
 
+## Table of contents <!-- omit in toc -->
+
+1. [Polkit](#polkit)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
 ## Polkit
 
-Requires [polkit] to be:
+Requires [`polkit`][polkit] to be:
 
 - installed
 - configured to authorize and authenticate the users
@@ -13,12 +19,21 @@ pkexec COMMAND
 
 ## Further readings
 
-- [pkexec]
-
-[pkexec]: pkexec.md
+- [`pkexec`][pkexec]
 
 ## Sources
 
+All the references in the [further readings] section, plus the following:
+
 - [How to get gui sudo password prompt without command line]
 
+<!--
+  References
+  -->
+
+<!-- Knowledge base -->
+[pkexec]: pkexec.md
+[polkit]: polkit.md
+
+<!-- Others -->
 [how to get gui sudo password prompt without command line]: https://askubuntu.com/questions/515292/how-to-get-gui-sudo-password-prompt-without-command-line