Default automatic Return Links to disabled and review compatibility

docs/AGES.md

@@ -69,10 +69,9 @@ definition.
 Rivencraft writes gameplay settings to the world/server configuration managed
 by NeoForge. `descriptive_books.return_link_mode` accepts:
 
-- `ON_CREATION` (default): create one Return Link the first time a player
-  enters each Age.
+- `DISABLED` (default): never create Return Links automatically.
+- `ON_CREATION`: create one Return Link the first time a player enters each Age.
 - `ALWAYS`: create a Return Link after every successful Descriptive Book trip.
-- `DISABLED`: never create Return Links automatically.
 
 Each client has a separate `rivencraft-client.toml`. Its `book_preview.mode`
 setting accepts `AUTO`, `IMMERSIVE_PORTALS`, `PONDER`, or `LEGACY`. This changes