Merge pull request jupyter-widgets#1525 from dhirschfeld/patch-1

Updated labextension install info

docs/source/user_install.md

@@ -35,10 +35,11 @@ To install the JupyterLab extension you also need to run the below command in
 a terminal which requires that you have [nodejs](https://nodejs.org/en/)
 installed.
 ```bash
-jupyter labextension install @jupyterlab/nbwidgets
+jupyter labextension install @jupyter-widgets/jupyterlab-manager
 ```
 
-**Note:** A clean reinstall of the JupyterLab extension can be done by first deleting
-the lab directory before running the above command. The location of the lab 
-directory can be queried by executing `jupyter lab path` in your terminal.
+**Note:** A clean reinstall of the JupyterLab extension can be done by first
+running the `jupyter lab clean` command which will remove the staging and
+static directories from the lab directory. The location of the lab directory
+can be queried by executing the command `jupyter lab path` in your terminal.