[Doc Fix] Fix typo from Jupyter Notebook to Jupyter Lab in Ecosystem Doc.
I saw this typo in the [doc](https://pandas.pydata.org/pandas-docs/stable/ecosystem.html#jupyter-notebook-jupyter-lab).
Decided to create a PR for it. ;)
@junwoo091400 can you address comment by @gfyoung?  this should be almost ready Closing as stale, @junwoo091400 if you want to finish this please let us know, and we'll reopen.