[Content]: Problems with Data Loading documentation

[amirhhashemi]

📚 Subject area/topic

Data loading in SolidStart

📋 Page(s) affected (or suggested, for new content)

https://docs.solidjs.com/solid-start/building-your-application/data-loading

📋 Description of content that is out-of-date or incorrect

The Data Loading documentation has several areas for improvement:

Structure: The organization is counterintuitive, with only two main sections: "Data loading on the client" and "Data loading always on the server" (oddly, a subsection of the former). This structure doesn't effectively guide users through the various data loading methods.
Comparison: There's a lack of clear comparison between different data loading methods (createAsync, createResource, and Tanstack Query). The documentation doesn't provide guidance on when to use each method.
Depth: Some crucial concepts, like the load function, are inadequately explained. The documentation doesn't clearly outline when and how to use this function effectively.
Examples: The documentation lacks comprehensive examples, particularly:

• Using createResource with Suspense and ErrorBoundary
• Implementing Tanstack Query
• Demonstrating createAsync with actions

The proposed PR (#857) aims to address these issues.

🖥️ Reproduction in StackBlitz (if reporting incorrect content or code samples)

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