fix type on hfds long name

cmor-table/datasets.csv

@@ -584,8 +584,8 @@ volcello,fx,m3,Ocean Grid-Cell Volume,ocean_volume,"For oceans with more than 1
 thetao,day,degC,Sea Water Potential Temperature,sea_water_potential_temperature,,,,,,,,,,
 wo,mon,m/s,Sea Water Upward Velocity,upward_sea_water_velocity,,,,,,up,,,,
 rhop,mon,kg/m3,Sea Water Potential Density,sea_water_potential_density,,,,,,,,,,
-hfds,mon,W/m²,Downward Heat Flux at the Sea Water Surface,surface_downward_heat_flux_in_sea_water,,,,,,down,,,,
-hfds,day,W/m²,Downward Heat Flux at the Sea Water Surface,surface_downward_heat_flux_in_sea_water,,,,,,down,,,,
+hfds,mon,W/m²,Downward Heat Flux at Sea Water Surface,surface_downward_heat_flux_in_sea_water,,,,,,down,,,,
+hfds,day,W/m²,Downward Heat Flux at Sea Water Surface,surface_downward_heat_flux_in_sea_water,,,,,,down,,,,
 hfcorr,mon,W m-2,Heat Flux Correction,heat_flux_correction,,area: mean where sea time: mean,area: areacello,longitude latitude time,real,down,,,,
 hfcorr,day,W/m²,Heat Flux Correction,heat_flux_correction,,,,,,,,,,
 rsntds,mon,W m-2,Net Downward Shortwave Radiation at Sea Water Surface,net_downward_shortwave_flux_at_sea_water_surface,,area: mean where sea time: mean,area: areacello,longitude latitude time,real,down,,,,