Note Control's incompatibility with iframe stories in Docs mode

[kerryj89]

I think this will save people some time when they are wondering why changing from inline to iframe doesn't work with controls in docs mode.

Closes #

What I did

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[kylegach]

Thanks for this PR, @kerryj89!

We currently document this limitation here, https://storybook.js.org/docs/writing-docs/autodocs#the-controls-are-not-updating-the-story-within-the-auto-generated-documentation, but I agree it would be helpful to also add a callout on this page.

Can you please update this to:

1. Be a similar heading under Troubleshooting on this page
2. Link to the explanation on the other page

Thanks, and let me know if I can help.

[jonniebigodes]

@kerryj89, thank you for putting together this pull request and helping us improve the documentation. We appreciate it 🙏 ! However, the changes you're introducing were already added to a recent pull request. I hope you don't take it the wrong way, and I look forward to your next contribution.

Have a great day.

Stay safe.