docs: PowerSync Query-driven sync documentation improvements

[Chriztiaan]

🎯 Changes

There were some wording improvements and issues with the mermaid block diagrams (opted to use markdown tables instead).

✅ Checklist

• I have tested this the docs locally with a local tanstack.com project.

🚀 Release Impact

• This change is docs/CI/dev-only (no release).

[Chriztiaan]

FYI @samwillis

[pkg-pr-new]

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commit: fbd6fa4