Fix freq strings

Author: snitish

doc/source/user_guide/timeseries.rst

@@ -891,10 +891,10 @@ into ``freq`` keyword arguments. The available date offsets and associated frequ
     :class:`~pandas.tseries.offsets.BQuarterEnd`, ``'BQE``, "business quarter end"
     :class:`~pandas.tseries.offsets.BQuarterBegin`, ``'BQS'``, "business quarter begin"
     :class:`~pandas.tseries.offsets.FY5253Quarter`, ``'REQ'``, "retail (aka 52-53 week) quarter"
-    :class:`~pandas.tseries.offsets.HalfYearEnd`, ``'QE'``, "calendar half year end"
-    :class:`~pandas.tseries.offsets.HalfYearBegin`, ``'QS'``, "calendar half year begin"
-    :class:`~pandas.tseries.offsets.BHalfYearEnd`, ``'BQE``, "business half year end"
-    :class:`~pandas.tseries.offsets.BHalfYearBegin`, ``'BQS'``, "business half year begin"
+    :class:`~pandas.tseries.offsets.HalfYearEnd`, ``'HYE'``, "calendar half year end"
+    :class:`~pandas.tseries.offsets.HalfYearBegin`, ``'HYS'``, "calendar half year begin"
+    :class:`~pandas.tseries.offsets.BHalfYearEnd`, ``'BHYE``, "business half year end"
+    :class:`~pandas.tseries.offsets.BHalfYearBegin`, ``'BHYS'``, "business half year begin"
     :class:`~pandas.tseries.offsets.YearEnd`, ``'YE'``, "calendar year end"
     :class:`~pandas.tseries.offsets.YearBegin`, ``'YS'`` or ``'BYS'``,"calendar year begin"
     :class:`~pandas.tseries.offsets.BYearEnd`, ``'BYE'``, "business year end"