Document MDX optimize static logic

[bluwy]

Changes

Followup to #7151 (comment) suggested by @ematipico

This adds internal docs on how the MDX optimization feature work.

After writing this out, I have no idea if it makes things clearer 😅 I'm not the best explainer and it could be polished a bit more.

Testing

n/a

Docs

Adds internal documentation for how MDX optimization works.

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[ematipico]

To be honest, I find it really clear, and it helps A LOT!

[sarah11918]

Hey @bluwy, I'm so excited you're writing internal documentation! 🙌

Caught some little grammar things, and tried to point out where I thought flow or structure could be more helpful.

Admittedly, now you're writing stuff that I understand less-well, so there are some things here that sound like they could be improved to my editing ear, but I might not know exactly HOW to do that in this domain.

So, just take my suggestions for consideration, but you'll still have to do the heavy lifting for me. 😅

[bluwy]

Thanks for checking some of my silly mistakes @sarah11918. Sorry you have to go through that, I should run through a grammar checker next time 😅

I've applied most of your suggestions except #7221 (comment) that I'd like to make sure you see it before merging this.