fix: unkeyed show argument (#922)

src/routes/reference/components/show.mdx

@@ -9,11 +9,11 @@ The Show control flow is used to conditional render part of the view: it renders
 import { Show } from "solid-js"
 import type { JSX } from "solid-js"
 
-function Show<T>(props: {
+function Show<T, K>(props: {
 	when: T | undefined | null | false
 	keyed: boolean
 	fallback?: JSX.Element
-	children: JSX.Element | ((item: T) => JSX.Element)
+	children: JSX.Element | ((item: T | Accessor<T>) => JSX.Element)
 }): () => JSX.Element
 ```
 
@@ -33,6 +33,8 @@ Show can also be used as a way of keying blocks to a specific data model. For ex
 </Show>
 ```
 
+If the `keyed` property is not used, the argument of a child function will be an accessor containing the item.
+
 ## Props
 
 | Name       | Type                              | Description                                   |