Update flusurv schema and docs with new age, sex, and race groups - #1287

Update flusurv schema and docs with new age, sex, and race groups#1287

melange396 merged 7 commits into

ndefries/flusurv-new-endpointcmu-delphi/delphi-epidata:ndefries/flusurv-new-endpointfrom

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