Minor fixes

Author: MartinBraquet

pandas/core/generic.py

@@ -10818,12 +10818,8 @@ def describe(
         ----------
         percentiles : list-like of numbers, optional
             The percentiles to include in the output. All should
-            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.
+            fall between 0 and 1. The default, ``None``, will automatically
+            return the 25th, 50th, and 75th percentiles.
         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:

pandas/tests/frame/methods/test_describe.py

@@ -431,7 +431,7 @@ def test_refine_percentiles(self, percentiles):
         if percentiles is None:
             percentiles = [0.25, 0.5, 0.75]
 
-        expected = Series(
+        expected = DataFrame(
             {
                 "count": len(df.a),
                 "mean": df.a.mean(),
@@ -440,6 +440,7 @@ def test_refine_percentiles(self, percentiles):
                 **{f"{p:.0%}": df.a.quantile(p) for p in percentiles},
                 "max": df.a.max(),
             },
-        ).to_frame(name="a")
+            index=["a"],
+        ).T
 
         tm.assert_frame_equal(result, expected)