message: docs: update storybook doc
diff: @@ -14,3 +14,24 @@ Alternatively, you can demo your changes by using the following command while in
  ```sh
  yarn storybook
  ```
  +
  +### Tips
  +
  +When developing, if you would like to see live changes in Storybook.
  +
  +Instead of
  +
  +```js
  +import { xxx } from '@superset-ui/plugin-chart-horizon';
  +```
  +
  +which will point to the transpiled code.
  +
  +Do refer to `src`
  +
  +```js
  +import { xxx } from '@superset-ui/plugin-chart-horizon/src'
  +```
  +
  +Then after you are satisfied with all the changes, `yarn build` the entire project and remove `/src` from the `import` statement and check Storybook again. This rarely happens, but the minification sometimes can cause issue and you may see different results ranging from crashing to different behavior.
  +
  