Solid.js async rendering

[patdx]

Description (required)

This updates the documentation related to the changes in withastro/astro#6791

When that PR is merged, Solid users will be able to make use of async Solid features like createResource and lazy in the server rendering phase. This PR explains how to use those newly available features.

I made some small tweaks from the last PR version to try to make it more focused on how an Astro developer would use these features instead of being a technical explanation of how Astro would render the components.

Related issues & labels (optional)

For Astro version: 4.x. See astro PR #6791.

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