Fix a pronoun problem.

docs/source/getting_started/overview.rst

@@ -47,4 +47,4 @@ JupyterLab is served from the same `server
 <https://jupyter-notebook.readthedocs.io/en/stable/>`__ and uses the same
 `notebook document format <http://nbformat.readthedocs.io/en/latest/>`__ as the
 classic Jupyter Notebook. JupyterLab will eventually replace the classic Jupyter
-Notebook after it reaches 1.0.
+Notebook after JupyterLab reaches 1.0.