fix config example

config.yaml.example

@@ -5,16 +5,14 @@ admin_email: admin@example.org
 dev_domains:
   - dev
 
-db:
+mysql:
-  type: 'mysql'
+  host: "127.0.0.1"
-  mysql:
+  user: "user"
-    host: "127.0.0.1"
+  password: "password"
-    user: "user"
+  database: "dbname"
-    password: "password"
+  # misc
-    database: "dbname"
+  log: false
-    # misc
+  log_stat: false
-    log: false
-    log_stat: false
 
 
 umask: 0002