add help:commands artisan task to documentation

laravel/documentation/artisan/commands.md

@@ -2,6 +2,7 @@ # Artisan Commands
 
 ## Contents
 
+- [Help](#help)
 - [Application Configuration](#application-configuration)
 - [Sessions](#sessions)
 - [Migrations](#migrations)
@@ -12,6 +13,13 @@ ## Contents
 - [Application Keys](#keys)
 - [CLI Options](#cli-options)
 
+<a name="help"></a>
+## Help
+
+Description  | Command
+------------- | -------------
+View a list of available artisan commands. | `php artisan help:commands`
+
 <a name="application-configuration"></a>
 ## Application Configuration <small>[(More Information)](/docs/install#basic-configuration)</small>