Update installation instructions with troubleshooting tips

Added troubleshooting command for missing services.

Signed-off-by: arhimede <julian@dotkernel.com>

Author: arhimede

docs/book/v7/installation/test-the-installation.md

@@ -10,10 +10,10 @@ We recommend running your applications in WSL:
 - Set `$baseUrl` in **config/autoload/local.php** to the address of the virtualhost.
 - Run the application by opening the virtualhost address in your browser.
 
-You should see the `Dotkernel Admin` login page.
-
 > If you are getting server error 500, please check the folders permissions [Common permission issues](https://docs.dotkernel.org/development/v2/faq/#how-do-i-fix-common-permission-issues)
 
+You should see the `Dotkernel Admin` login page.
+
 > If you are getting exceptions or errors regarding some missing services, try running the following command:
 
 ```shell