Show that <Head /> is needed for custom document (#5376)

* Show that <Head /> is needed for custom document * Add comment explaining required Document fields * Update README.md

Show that <Head /> is needed for custom document (#5376)
* Show that <Head /> is needed for custom document * Add comment explaining required Document fields * Update README.md
299cc65d · Adam Stankiewicz · Tim Neutkens · 61fe50a4 · 299cc65d
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packages/next/README.md packages/next/README.md +2 -0

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--- a/packages/next/README.md
+++ b/packages/next/README.md
@@ -1120,6 +1120,8 @@ export default class MyDocument extends Document {
 }
 ```

+All of `<Head />`, `<Main />` and `<NextScript />` are required for page to be properly rendered.
+
 The `ctx` object is equivalent to the one received in all [`getInitialProps`](#fetching-data-and-component-lifecycle) hooks, with one addition:

 - `renderPage` (`Function`) a callback that executes the actual React rendering logic (synchronously). It's useful to decorate this function in order to support server-rendering wrappers like Aphrodite's [`renderStatic`](https://github.com/Khan/aphrodite#server-side-rendering)