docs: change return type of async data from undefined
to null
in v3 docs
#32562
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🔗 Linked issue
No issue but had some discussion on discord:

https://discord.com/channels/473401852243869706/473407466630152201/1392132868557508628
📚 Description
The return type of
AsyncData
is stillDataT | null
in v3. This changes the v3 docs to be in line with this. Same for error anduseNuxtData
.