Refine docstrings

Author: MartinBraquet

pandas/core/generic.py

@@ -10818,9 +10818,12 @@ def describe(
         ----------
         percentiles : list-like of numbers, optional
             The percentiles to include in the output. All should
-            fall between 0 and 1. The default is
-            ``[.25, .5, .75]``, which returns the 25th, 50th, and
-            75th percentiles.
+            fall between 0 and 1. Here are the options:
+
+            - A list-like of numbers : To include the percentiles listed. If
+              that list is empty, no percentiles will be returned.
+            - None (default) : To include the default percentiles, which are the
+              25th, 50th, and 75th ones.
         include : 'all', list-like of dtypes or None (default), optional
             A white list of data types to include in the result. Ignored
             for ``Series``. Here are the options: