Clarification of caching behavior

[aryzing]

The example contains at least one inacurate statement,

It will then cache the data using 'todos' and fetchTodos as the unique identifiers for that cache.

and could benefit from more precise language.

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[TkDodo]

could you maybe port this to the v4 docs (base on the alpha branch)? I remember updating that section because the querykeys need to be an array in v4.

[aryzing]

Corrected suggestions and rebased on alpha branch as requested, new PR here: #3221