Link should be clickable (librenms#17823)

Author: murrant

doc/Extensions/Plugin-System.md

@@ -21,7 +21,7 @@ There are two ways to create a plugin.
 
 ### Plugin package
 
-Create a package according to the Laravel documentation https://laravel.com/docs/packages
+Create a package according to the Laravel documentation [https://laravel.com/docs/packages](https://laravel.com/docs/packages)
 To tie in to specific parts of LibreNMS such as the Menu, Device Overview or a Port Tab, use Plugin Hooks.
 
 You can see an example plugin here: [example plugin repository](https://github.com/murrant/librenms-example-plugin).