chore(docs): Add wrapRootElement + Head API limitation (#36580)

Co-authored-by: Lennart <[email protected]>

Author: marvinjude

docs/docs/reference/built-in-components/gatsby-head.md

@@ -88,6 +88,7 @@ You'll need to be aware of these things when using Gatsby Head:
 - The `Head` function needs to return valid JSX.
 - Valid tags inside the `Head` function are: `link`, `meta`, `style`, `title`, `base`, `script`, and `noscript`.
 - Data block `<script>` tags such as `<script type="application/ld+json">` can go in the `Head` function, but dynamic scripts are better loaded with the [Gatsby Script Component](/docs/reference/built-in-components/gatsby-script/) in your pages or components.
+- As of now, `Head` can't access [React Context](https://reactjs.org/docs/context.html) that you defined in the [`wrapRootElement` API](/docs/reference/config-files/gatsby-browser/#wrapRootElement).
 
 ## Properties