Replace story.image for story.thumbnail (#4793)

Summary:
The Story component expects the property to be named "thumbnail" https://github.com/relayjs/relay-examples/blob/main/newsfeed/src/components/Story.tsx#L24

Pull Request resolved: #4793

Reviewed By: evanyeung

Differential Revision: D63033028

Pulled By: captbaritone

fbshipit-source-id: 12c3c0bb3a3770bc43479710b0c62569b8691ce6

website/docs/tutorial/fragments-1.md

@@ -25,7 +25,7 @@ const NewsfeedQuery = graphql`
           url
         }
       }
-      image {
+      thumbnail {
         url
       }
     }
@@ -56,7 +56,7 @@ export default function Story({story}: Props) {
       <Heading>{story.title}</Heading>
       // change-line
       <Timestamp time={story.createdAt} /> // Add this line
-      <Image image={story.image} />
+      <Image image={story.thumbnail} />
       <StorySummary summary={story.summary} />
     </Card>
   );
@@ -95,7 +95,7 @@ const StoryFragment = graphql`
         url
       }
     }
-    image {
+    thumbnail {
       url
     }
   }
@@ -146,7 +146,7 @@ export default function Story({story}: Props) {
       <Heading>{data.title}</Heading>
       <PosterByline poster={data.poster} />
       <Timestamp time={data.createdAt} />
-      <Image image={data.image} />
+      <Image image={data.thumbnail} />
       <StorySummary summary={data.summary} />
     </Card>
   );