Sync kit docs (#1418)

sync kit docs

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apps/svelte.dev/content/docs/kit/20-core-concepts/20-load.md

@@ -207,7 +207,7 @@ Universal `load` functions are called with a `LoadEvent`, which has a `data` pro
 
 A universal `load` function can return an object containing any values, including things like custom classes and component constructors.
 
-A server `load` function must return data that can be serialized with [devalue](https://github.com/rich-harris/devalue) — anything that can be represented as JSON plus things like `BigInt`, `Date`, `Map`, `Set` and `RegExp`, or repeated/cyclical references — so that it can be transported over the network. Your data can include [promises](#Streaming-with-promises), in which case it will be streamed to browsers.
+A server `load` function must return data that can be serialized with [devalue](https://github.com/rich-harris/devalue) — anything that can be represented as JSON plus things like `BigInt`, `Date`, `Map`, `Set` and `RegExp`, or repeated/cyclical references — so that it can be transported over the network. Your data can include [promises](#Streaming-with-promises), in which case it will be streamed to browsers. If you need to serialize/deserialize custom types, use [transport hooks](https://svelte.dev/docs/kit/hooks#Universal-hooks-transport).
 
 ### When to use which