message: chore: update documentation
diff: 1. First, make sure you have run `yarn` and `yarn build` in `superset-ui` or your own plugin repo.
  2. Go to
  - [superset-frontend](https://github.com/apache/incubator-superset/tree/master/superset-frontend),
  + [superset-frontend](https://github.com/apache/superset/tree/master/superset-frontend),
  use `npm link` to create a symlink of the plugin source code in `node_modules`:
  ```sh
  - cd incubator-superset/superset-frontend
  + cd superset/superset-frontend
  # npm link ~/path/to/your/plugin
  npm link ../../superset-ui/plugins/plugin-chart-word-cloud
  ```
  ## Deactivate plugins
  -To deactivate a plugin, simply run `npm install` in `incubator-superset/superset-frontend` again.
  +To deactivate a plugin, simply run `npm install` in `superset/superset-frontend` again.
  