Give security warning

host.yaml

@@ -70,6 +70,7 @@ multi_mystery_options:
   pre_roll: false
   # Option to use pre-rolled settings.  If not enabled, attempts to use a pre-rolled yaml WILL fail with
   # "Please fix your yaml."
+  # Warning: only use this to load files you've created yourself.
   use_pre_rolled: false
   # Automatically launches {player_name}.yaml's ROM file using the OS's default program once generation completes. (likely your emulator)
   # Does nothing if the name is not found