fix typo

Author: LiamConnors

doc/python/b64.md

@@ -45,7 +45,7 @@ The following types of array objects in Python are supported:
 
 - Numpy `numpy.ndarray` objects.
 - Pandas Index, `pandas.Index`, or Series, `pandas.Series`, objects.
-- Array objects that can be converted to `numpy.ndarray` objects. i.e., they implement `"__array__"` or `"__array_interface__"` and return a `numpy.ndarray.
+- Array objects that can be converted to `numpy.ndarray` objects. i.e., they implement `"__array__"` or `"__array_interface__"` and return a `numpy.ndarray`.
 
 The following array data types are supported: