Fix document type import path (#32117)

There was a mistake in #32077 which imported a different module than _document in the _document .d.ts file. I found that we didn't have a test for a custom _document.tsx and _app.tsx with TypeScript, so I've added one that fails on canary and passes with this fix to ensure this does not happen in the future.

Fixes #32110




## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`

Author: timneutkens

packages/next/document.d.ts

@@ -1,3 +1,3 @@
-import Document from './dist/shared/lib/runtime-config'
+import Document from './dist/pages/_document'
 export * from './dist/pages/_document'
 export default Document

test/integration/typescript/pages/_app.tsx

@@ -0,0 +1,20 @@
+// import App from "next/app";
+import type { AppProps /*, AppContext */ } from 'next/app'
+
+function MyApp({ Component, pageProps }: AppProps) {
+  return <Component {...pageProps} />
+}
+
+// Only uncomment this method if you have blocking data requirements for
+// every single page in your application. This disables the ability to
+// perform automatic static optimization, causing every page in your app to
+// be server-side rendered.
+//
+// MyApp.getInitialProps = async (appContext: AppContext) => {
+//   // calls page's `getInitialProps` and fills `appProps.pageProps`
+//   const appProps = await App.getInitialProps(appContext);
+
+//   return { ...appProps }
+// }
+
+export default MyApp

test/integration/typescript/pages/_document.tsx

@@ -0,0 +1,11 @@
+import Document, { DocumentContext } from 'next/document'
+
+class MyDocument extends Document {
+  static async getInitialProps(ctx: DocumentContext) {
+    const initialProps = await Document.getInitialProps(ctx)
+
+    return initialProps
+  }
+}
+
+export default MyDocument