updated upsert example response and option

[7ttp]

updates the upserting into tables with constraints example to show the correct response, and adds the missing onConflict option to the return-the-exact-number-of-rows example.

i have read the contributing.md file:
yes

what kind of change does this pr introduce?
docs update

what is the current behavior?
the upsert docs show an incorrect response example and the second example is missing the onConflict option.

what is the new behavior?
the first example shows the correct response, and the second example includes the onConflict option so both examples match expected behavior.

additional context:
fixes #40653

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Project	Deployment	Preview	Comments	Updated (UTC)
design-system	Skipped			Nov 20, 2025 4:57pm

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[7ttp]

@mandarini

[mandarini]

@7ttp thank you for this. Can you please move these examples in tsdoc in the https://github.com/supabase/supabase-js repo?

We are going some changes on how docs are rendered and that would be super helpful.

Example syntax: https://typedoc.org/documents/Tags._example.html

[7ttp]

@mandarini Done, moved the examples as requested!

[mandarini]

Thank you!