Update createResource, add "state" field. (#918)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: klequis

src/routes/reference/basic-reactivity/create-resource.mdx

@@ -8,11 +8,11 @@ There are two ways to use `createResource`: you can pass the fetcher function as
 The source signal will retrigger the fetcher whenever it changes, and its value will be passed to the fetcher.
 
 ```tsx
-const [data, { mutate, refetch }] = createResource(fetchData)
+const [data, { mutate, refetch, state }] = createResource(fetchData)
 ```
 
 ```tsx
-const [data, { mutate, refetch }] = createResource(source, fetchData)
+const [data, { mutate, refetch, state }] = createResource(source, fetchData)
 ```
 
 In these snippets, the fetcher is the function `fetchData`, and `data()` is undefined until `fetchData` finishes resolving. 
@@ -49,7 +49,7 @@ async function fetchData(source, { value, refetching }) {
 	// or equal to the optional data passed: `refetch(info)`
 }
 
-const [data, { mutate, refetch }] = createResource(getQuery, fetchData)
+const [data, { mutate, refetch, state }] = createResource(getQuery, fetchData)
 
 // read value
 data()
@@ -102,7 +102,7 @@ You can use the new `ssrLoadFrom` option for this.
 Instead of using the default `server` value, you can pass `initial` and the resource will use `initialValue` as if it were the result of the first fetch for both SSR and hydration.
 
 ```tsx
-const [data, { mutate, refetch }] = createResource(() => params.id, fetchUser, {
+const [data, { mutate, refetch, state }] = createResource(() => params.id, fetchUser, {
 	initialValue: preloadedData,
 	ssrLoadFrom: "initial",
 })
@@ -197,4 +197,4 @@ function createResource<T, U>(
 	options?: ResourceOptions<T, U>
 ): ResourceReturn<T>
 
-```
+```