message: Update comment to indicate relative propertions
  This was changed recently so it doesn't strictly need to be percent
  values.
diff: @@ -29,7 +29,7 @@ namespace {
  const auto TileDrawSize = NAS2D::Vector{128, 64};
  const auto TileDrawOffset = NAS2D::Vector{TileDrawSize.x / 2, TileDrawSize.y - TileSize.y};
  - /** Array indicates percent of mines that should be of yields LOW, MED, HIGH */
  + // Relative proportion of mines with yields {low, med, high}
  const std::map<Planet::Hostility, std::array<int, 3>> HostilityMineYields =
  {
  {Planet::Hostility::Low, {30, 50, 20}},
  