Empty line missing for DataArray.assign_coords doc (#3963)

Author: EtienneCmb

xarray/core/common.py

@@ -455,6 +455,7 @@ def assign_coords(self, coords=None, **coords_kwargs):
             lon_2    (lon) int64 300 289 0 1
 
         Note that the same result can also be obtained with a dict e.g.
+
         >>> _ = da.assign_coords({"lon_2": ('lon', lon_2)})
 
         Notes