[docs] clarification on how `data` resolves keys with the same name

[sacrosanctic]

Describe the bug

If multiple load functions return data with the same key, the last one ‘wins’
https://svelte.dev/docs/kit/load#Layout-data

Q1: What does "last one" mean? how are load functions ordered? This is confusing as another section mentions that they run in parallel.

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Q2: Are load functions ordered differently during SSR vs CSR. Are the following statements correct?

• In SSR, all load functions run in parallel
• In CSR, all server load functions then all universal load functions

Reproduction

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Logs

System Info

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Severity

annoyance

Additional Information

No response