Pandas Doc: Incorrect exmaples for 'GroupBy.apply' functon

Example 1 and Example 2 are both incorrect for 'GroupBy.apply' functon in document.

>>>  df = pd.DataFrame({'A': 'a a b'.split(), 'B': [1,2,3], 'C': [4,6, 5]})
>>>  g = df.groupby('A') 

The following changes should be made.

Example1

>>> g[['B','C']].apply(lambda x: x / x.sum())  
          B    C
0  0.333333  0.4
1  0.666667  0.6
2  1.000000  1.0

Example2

>>> g[['B','C']].apply(lambda x: x.max() - x.min()) 
   B  C
A      
a  1  2
b  0  0

Comment From: jorisvandenbossche

@ZhuBaohe Thanks for the report! You are correct. It was recently already reported here: https://github.com/pandas-dev/pandas/issues/19337, so closing this issue.