Fixed typos doc pydata#2304

Author: Daoud Jahdou

xarray/backends/api.py

@@ -230,7 +230,7 @@ def open_dataset(filename_or_obj, group=None, decode_cf=True,
         dataset. This may be useful to drop variables with problems or
         inconsistent values.
     force_promote_float64: bool
-        If True force int variables with scale factorto be promoted to
+        If True force int variables with scale factor to be promoted to
         float64 instead of float32
     backend_kwargs: dictionary, optional
         A dictionary of keyword arguments to pass on to the backend. This