Update env.example

Author: damalis

env.example

@@ -28,6 +28,6 @@ PMA_HTPASSWD_USERNAME=db_username
 PMA_HTPASSWD_PASSWORD=db_password
 PMA_UPLOAD_LIMIT=8M
 PMA_MEMORY_LIMIT=-1
-APACHE_CONFDIR=/etc/apache2
+APACHE_CONFDIR_PREFIX=/etc/apache2
 
 REDIS_CONF_PREFIX=/usr/local/etc