Fix SS06 formatting errors 
More SS06 (Summary should fit in a single line) errors fixed (#29254):

The following docstrings were examined and fixed:
```
pandas.DataFrame
pandas.DataFrame.transform
pandas.DataFrame.corrwith
pandas.DataFrame.describe
pandas.DataFrame.kurt
pandas.DataFrame.kurtosis
pandas.DataFrame.skew
pandas.DataFrame.align
pandas.DataFrame.drop_duplicates
pandas.DataFrame.duplicated

```

Validated with python scripts/validate_docstrings.py

Also referencing issue: #27977
Hello @profwacko! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:





There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2019-10-30 16:57:01 UTC Thanks @profwacko 