DOC: Improve describe() doc in getting started

[NicoLoco]

In the "getting started tutorial" here: https://pandas.pydata.org/docs/getting_started/intro_tutorials/01_table_oriented.html

The following sentence is incorrect
Many pandas operations return a DataFrame or a Series. The describe() method is an example of a pandas operation returning a pandas Series.

It should say "The describe() method is an example of a pandas operation returning a pandas DataFrame"

Steps to reproduce

import pandas as pd
df = pd.DataFrame({
... "Name" : ["Ally", "Bob", "Charly"],
... "Age" : [15,25,36],
... "Cash": [1000,5000, 20000]});
d = df.describe()
type(d)
<class 'pandas.core.frame.DataFrame'>

[mzeitlin11]

Thanks for the report @NicoLoco! Could you please edit your issue title to reflect the content?

Agreed that this is wrong, though it's not quite so clear because describe can return a Series if applied to a Series. Clarification would certainly be helpful here since in the example usage the result is a DataFrame, not a Series.

[bharatr21]

take