Resolve 2 possible error(s) in volume frus1918Russiav02

[WaxCylinderRevival]

Volume: frus1918Russiav02 Volume Dates: 1917 to 1918

• [x] https://history.state.gov/historicaldocuments/frus1918Russiav02/d570

  • LATER than coverage dates
  • @when value: 1919-01-01T13:00:00
  • Recorded date: January 1, 1919, 1 p.m.
  • [x] Confirmed correctness of document date

• [x] https://history.state.gov/historicaldocuments/frus1918Russiav02/d828

  • LATER than coverage dates
  • @when value: 1919-01-02T13:00:00
  • Recorded date: January 2, 1919, 1 p.m.
  • [x] Confirmed correctness of document date

[WaxCylinderRevival]

• [x] Update coverage dates in volume bibliography:

  <coverage type="from">1917</coverage>
  <coverage type="to">1919</coverage>

[WaxCylinderRevival]

• [x] Commit changes: https://github.com/HistoryAtState/frus/commit/006af7121a98a0232455e908073a9ac2d62b10b7