DOC: remove rplot seaborn equivalent example figures
## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13954?src=pr) is 85.29% (diff: 100%)

> Merging [#13954](https://codecov.io/gh/pydata/pandas/pull/13954?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will decrease coverage by **<.01%**

``` diff
@@             master     #13954   diff @@
==========================================
  Files           139        139          
  Lines         50159      50162     +3   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits          42785      42785          
- Misses         7374       7377     +3   
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last update [0e7ae89...9343486](https://codecov.io/gh/pydata/pandas/compare/0e7ae89115e60419b807c38b9e4b8a19d4c8f830...9343486b8682c9576cf449207736fe54461ef4b8?src=pr)
