docs: Clarify S3 and ODBC docs

[peasee]

🗣 Description

• Clarifies the folder-loading behavior of paths for S3
• Clarifies when file_format needs to be specified for S3
• Clarifies parameters for ODBC
• Clarifies SQL dialect detection for ODBC

🔨 Related Issues

• Closes #640
• Closes #643

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Name	Status	Preview	Comments	Updated (UTC)
spiceai-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 20, 2024 5:57am