Merge pull request #2073 from flying-sheep/patch-1

Fixed source build instructions

Author: SylvainCorlay

packages/jupyterlab-manager/README.md

@@ -37,7 +37,7 @@ Source Build
 
 ```bash
 git clone https://github.com/jupyter-widgets/ipywidgets.git
-cd packages/jupyterlab-manager
+cd ipywidgets/packages/jupyterlab-manager
 npm install
 npm run build
 jupyter labextension link .