DOC: Fix typo in timeseries.rst

Author: ananiavito

doc/source/user_guide/timeseries.rst

@@ -2570,7 +2570,7 @@ because daylight savings time (DST) in a local time zone causes some times to oc
 twice within one day ("clocks fall back"). The following options are available:
 
 * ``'raise'``: Raises a ``ValueError`` (the default behavior)
-* ``'infer'``: Attempt to determine the correct offset base on the monotonicity of the timestamps
+* ``'infer'``: Attempt to determine the correct offset based on the monotonicity of the timestamps
 * ``'NaT'``: Replaces ambiguous times with ``NaT``
 * ``bool``: ``True`` represents a DST time, ``False`` represents non-DST time. An array-like of ``bool`` values is supported for a sequence of times.