docs: actual example for pvt_norostat

[dsweber2]

pvt_norostat's locations are a bit unusual. This gives at least one functional example. Ideally we'd also point at a full list of the locations, but as per cmu-delphi/delphi-epidata#1209 there isn't such a public list atm

[codecov-commenter]

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[brookslogan]

Possible locations are dynamic as the set of NoroSTAT participating states changes. Location possibilities can be fetched via pvt_meta_norostat. Filling out a bit more info in the linked issue.