add section about using revalidate together with redirect

Author: brenelz

src/routes/solid-router/reference/response-helpers/redirect.mdx

@@ -72,3 +72,13 @@ function redirect(url: string, init?: number | RouterResponseInit): CustomRespon
 ``` 
 
 The `RouterResponseInit` type extends the native [`ResponseInit`](https://developer.mozilla.org/en-US/docs/Web/API/Response/Response#options) interface.
+
+## Revalidate Query Keys
+
+You can pass query keys to the redirect helper to revalidate them.
+
+```ts
+redirect("/", { revalidate: ["getUser", getUser.keyFor(id)] });
+```
+
+This will only invalidate the query keys passed to the redirect helper instead of the entire next page.