[Style Guide] Document using JSX in partials

[KianNH]

Summary

Documents using JSX in partials

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https://developers.cloudflare.com/style-guide/components/render/	https://kian-pcx-5636.cloudflare-docs-7ou.pages.dev/style-guide/components/render/

[pedrosousa]

Hi Kian! A couple of requests:

• Can we expand the example a bit more? Not everyone in the team is well versed in JSX and how to create these optional blocks from start to finish. Even if we need to repeat ourselves a bit with content already covered in other pages... If the example also covered the use of the Markdown component it would be great!
• Can we add an if/then/else example, probably using a condition ? true : false conditional?