docs: update storybook doc

superset-frontend/temporary_superset_ui/superset-ui/docs/storybook.md

@@ -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.
+