Fix erroneous usage of some method in example code

[apasel422]

The PrivateAttributionAggregationServices interface is setlike, so in order to call some we must first call values.

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[apasel422]

It's not clear to me how useful setlike is here, given that the values are dictionaries. Separately, we may want to consider changing this to maplike instead, with the keys being url.

[martinthomson]

Would maplike be easier to use, or harder? That is, what difference is there in this example code?

[apasel422]

Would maplike be easier to use, or harder? That is, what difference is there in this example code?

To me there's little benefit to this interface being setlike, since the element type is a dictionary, rather than something that can be compared for equality beyond object identity. If it was a maplike, we could have it keyed on the service URL, which would make this example able to do a lookup without calling some.