video.adoc: Document requirement for overclock for certain 4K modes

[ghost]

raspberrypi/linux#5038 makes certain 4K modes (and anything beyond) conditional on the BCM2711 core being overclocked to at least 600MHz - document this requirement.

[ghost]

This is a draft, since raspberrypi/linux#5038 is also a draft, so may change or disappear.

[JamesH65]

Might be Github, but ¹ is rendering as "¹" not the superscript wanted.

[JamesH65]

Might be Github, but 1 is rendering as "1" not the superscript wanted.

Hahahah, so, it actually rendered correctly in the comment. That's funny right there

<sup>1</sup> is rendering as "<sup>1</sup>"

[ghost]

Might be Github, but 1 is rendering as "1" not the superscript wanted.

Thanks - I need to set up a local build environment again - back in the markdown days that worked, but I believe we're sanitising HTML now, or something.

[lurch]

https://docs.asciidoctor.org/asciidoc/latest/text/subscript-and-superscript/

[ghost]

OK - try now. I'm open to suggestion as to whether or not the bold is required:

.

[ghost]

Removed draft flag as raspberrypi/linux#5038 is about to integrate.

[lurch]

Can you revert the change to Makefile please?

[ghost]

Apologies folks - I thought this one was ready to integrate - it is now.

I guess I need to stop using git add -A 😕

[aallan]

Everyone happy? Ready to merge?

[lurch]

I just had a quick scan through https://www.raspberrypi.com/documentation/computers/config_txt.html and there doesn't seem to be any other places (on that page) where we've used a superscript number like this. I wonder if it might be better to just add a "needs overclock" (alongside the "Pi 4" text) in the existing "Notes" column:

...and then add a NOTE: block underneath the table explaining the overclocking requirement? 🤷‍♂️

[ghost]

I just had a quick scan through https://www.raspberrypi.com/documentation/computers/config_txt.html and there doesn't seem to be any other places (on that page) where we've used a superscript number like this. I wonder if it might be better to just add a "needs overclock" (alongside the "Pi 4" text) in the existing "Notes" column ...and then add a NOTE: block underneath the table explaining the overclocking requirement? man_shrugging

That sounds a bit like a recipe for disaster - having the explanation split in two. We have used superscript elsewhere in the docs, so there is precident.

[lurch]

Up to @aallan ...

[aallan]

I think we're okay.