Improve lineplot example
Improve lineplot example

sauliusl/seaborn,arokem/seaborn,anntzer/seaborn,phobson/seaborn,petebachant/seaborn,anntzer/seaborn,arokem/seaborn,phobson/seaborn,lukauskas/seaborn,mwaskom/seaborn,mwaskom/seaborn,lukauskas/seaborn