update error details

documentation/docs/98-reference/.generated/client-errors.md

@@ -126,6 +126,8 @@ The `%rune%` rune is only available inside `.svelte` and `.svelte.js/ts` files
 `setContext` must be called when a component first initializes, not in a subsequent effect or after an `await` expression
 ```
 
+This restriction only applies when using the `experimental.async` option, which will be active by default in Svelte 6.
+
 ### state_descriptors_fixed
 
 ```

packages/svelte/messages/client-errors/errors.md

@@ -84,6 +84,8 @@ This restriction only applies when using the `experimental.async` option, which
 
 > `setContext` must be called when a component first initializes, not in a subsequent effect or after an `await` expression
 
+This restriction only applies when using the `experimental.async` option, which will be active by default in Svelte 6.
+
 ## state_descriptors_fixed
 
 > Property descriptors defined on `$state` objects must contain `value` and always be `enumerable`, `configurable` and `writable`.