Update LazyImageFull story info

Author: fpapado

stories/LazyImageFull.story.js

@@ -24,7 +24,9 @@ const Container = ({children}) => (
 storiesOf('LazyImageFull', module).add(
   'Basic use',
   withInfo(
-    'Component that preloads the image once in the viewport and only swaps once ready'
+    LazyImageFull gives you more fine-grained control over the rendering, by passing the state to the render prop.
+    Useful if you are doing css transitions, and where only some parts of the tree need to change.
+    Anything you can implement with LazyImage, you can implement with LazyImageFull.
   )(() => (
     <Container>
       <LazyImageFull src="https://www.fillmurray.com/g/600/400">