Clarify how to deal with init.lua

docs/en/src/configuration.md

@@ -133,3 +133,16 @@ return {
   }
 }
 ```
+
+---
+
+> Note:
+>
+> It's not recommended to copy the entire configuration, unless you want to
+> freeze it and miss out on useful updates to the defaults.
+>
+> Instead, you can use this as a reference to overwrite only the parts you
+> want to update.
+>
+> If you still want to copy the entire configuration, make sure to put your
+> customization before the return statement.

src/init.lua

@@ -3025,3 +3025,15 @@ return {
   on_mode_switch = {},
   on_layout_switch = {},
 }
+
+-- ----------------------------------------------------------------------------
+-- > Note:
+-- >
+-- > It's not recommended to copy the entire configuration, unless you want to
+-- > freeze it and miss out on useful updates to the defaults.
+-- >
+-- > Instead, you can use this as a reference to overwrite only the parts you
+-- > want to update.
+-- >
+-- > If you still want to copy the entire configuration, make sure to put your
+-- > customization before the return statement.