install_ez_platform.md: Remove empty tip box

Was introduced in 490c026

Author: adriendupuis

docs/getting_started/install_ez_platform.md

@@ -134,8 +134,6 @@ After a moment the installer will ask you to provide a few parameters:
     After changing the app secret, make sure that you clear the application cache and log out all the users.
     For more information, see [Symfony documentation]([[= symfony_doc =]]/reference/configuration/framework.html#secret).
 
-!!! tip
-
 !!! tip
 
     If you want to change any of these parameters later, you can do it in `app/config/parameters.yml`.