DOC: rm np import (#4949)

* DOC: add xr import

* DOC: remove imports

Author: raybellwaves

xarray/core/common.py

@@ -1188,7 +1188,6 @@ def where(self, cond, other=dtypes.NA, drop: bool = False):
 
         Examples
         --------
-        >>> import numpy as np
         >>> a = xr.DataArray(np.arange(25).reshape(5, 5), dims=("x", "y"))
         >>> a
         <xarray.DataArray (x: 5, y: 5)>