Docs: Note that need to turn off mdxRs when using MDX plugins

[paulwongx]

What is the improvement or update you wish to see?

As per this issue, it's not stated in the docs that you need to turn off mdxRs in order to use remark/rehype/recma plguins. https://stackoverflow.com/questions/75571651/using-remark-and-rehype-plugins-with-nextjs-13

The relevant part of the docs is here: https://beta.nextjs.org/docs/guides/mdx#remark-and-rehype-plugins

Is there any context that might help us understand?

State that mdxRs needs to be turned off for import nextMDX from "@next/mdx" to work.

Does the docs page already exist? Please link to it.

https://beta.nextjs.org/docs/guides/mdx#remark-and-rehype-plugins

[mattrossman]

This was really frustrating for me because the docs specifically tell you to enable mdxRs at the start, then proceeds to show how to add plugins, then at the very end of the page it's mentioned not to use the option because it's experimental. Took me a while to connect the dots as to why plugins were silently failing.

If the option isn't recommended, it probably shouldn't be in the "Getting Started" section that newcomers will be following.

[lu-zen]

This still is a problem.

[leerob]

Fixed!

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