Add docs for preRenderedFetch param to render

[yurynix]

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It adds docs for preRenderedFetch param introduced in:
withastro/astro#13403

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[ArmandPhilippot]

Thanks, and welcome to Team Docs! 🙌🏽 I only left a few suggestions to fix the type and a typo.

[sarah11918]

Thank you @yurynix, these docs look great! I've edited the text to be written more in the style of Astro Docs writing, so please take a look at my suggestion and correct it if it is inaccurate. You are the expert in your feature!

I will also note that I left a question in the astro implementation PR about the name of the option. I am not sure that it accurately describes the option, and I will let everyone discuss naming in the other PR!