Update multi-drag.md

docs/patterns/multi-drag.md

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 Dragging multiple `<Draggable />`s at once (multi drag) is currently a pattern that needs to be built on top of `react-beautiful-dnd`. We have not included the interaction into the library itself. This is done because a multi drag experience introduces a lot of concepts, decisions and opinions. We have done a lot of work to ensure there is a standard base of [dom event management](/docs/guides/how-we-use-dom-events.md) to build on.
 
-We have created a [reference application](https://react-beautiful-dnd.netlify.com/iframe.html?selectedKind=Multi%20drag&selectedStory=pattern&full=0&down=1&left=1&panelRight=0&downPanel=storybook%2Factions%2Factions-panel) ([source](/stories/9-multi-drag-story.js)) which implements this multi drag pattern. The application is fairly basic and does not handle performance in large lists well. As such, there is are [a few performance recommendations](#performance) that we suggest you also add on to our reference application if you want to support lists greater than 50 in size.
+We have created a [reference application](https://react-beautiful-dnd.netlify.com/iframe.html?selectedKind=Multi%20drag&selectedStory=pattern&full=0&down=1&left=1&panelRight=0&downPanel=storybook%2Factions%2Factions-panel) ([source](/stories/src/multi-drag)) which implements this multi drag pattern. The application is fairly basic and does not handle performance in large lists well. As such, there is are [a few performance recommendations](#performance) that we suggest you also add on to our reference application if you want to support lists greater than 50 in size.
 
 ![multi drag demo](https://user-images.githubusercontent.com/2182637/37322724-7843a218-26d3-11e8-9ebb-8d5853387bb3.gif)