DOC: Remove inconsistency with timestamp data in describe() method docs (#56937)

Remove inconsistency in describe() method docs

Author: alpakpinar

pandas/core/generic.py

@@ -11815,10 +11815,10 @@ def describe(
         upper percentile is ``75``. The ``50`` percentile is the
         same as the median.
 
-        For object data (e.g. strings or timestamps), the result's index
+        For object data (e.g. strings), the result's index
         will include ``count``, ``unique``, ``top``, and ``freq``. The ``top``
         is the most common value. The ``freq`` is the most common value's
-        frequency. Timestamps also include the ``first`` and ``last`` items.
+        frequency.
 
         If multiple object values have the highest count, then the
         ``count`` and ``top`` results will be arbitrarily chosen from