src/doc/en/installation/launching.rst: Also mention Jupyter Extension

Author: Matthias Koeppe

src/doc/en/installation/launching.rst

@@ -248,7 +248,8 @@ Here are steps to use SageMath in a Jupyter notebook in VS Code:
   in Windows.
 
 * Click the "Extension" icon on the left (or press :kbd:`Ctrl` +
-  :kbd:`Shift` + :kbd:`X`) to open a list of extensions. Install "Remote - WSL".
+  :kbd:`Shift` + :kbd:`X`) to open a list of extensions. Install the
+  "Remote - WSL" and "Jupyter" extensions.
 
 * In the command palette (:kbd:`Ctrl` + :kbd:`Shift` + :kbd:`P`),
   enter "Remote-WSL: New Window", and hit :kbd:`Enter`.