minor languague style change in the description

janelle · janelle · commit 7840d520c1fd · 2018-03-10T15:05:41.000+01:00
diff --git a/pandas/core/indexes/datetimes.py b/pandas/core/indexes/datetimes.py
@@ -1728,7 +1728,7 @@ def freq(self, value):
         'is_month_start',
         'is_month_start',
         """
-        Returns a boolean indicating if the date is the first day of the month.
+        Return a boolean indicating if the date is the first day of the month.
 
         Returns
         -------
