[demos] Improve v6

Author: jamesgpearce

site/demos/04_todo/v6.md

@@ -167,19 +167,17 @@ and function from the app-level state, and renders either a button to create a
 room and start sharing, or a link to the room that is already being shared to.
 
 ```jsx
-const Share = ({roomId, createRoomId}) => {
-  return (
-    <div id="room">
-      {roomId ? (
-        <a href={'?' + roomId} target="_blank">
-          &#128279; Share link
-        </a>
-      ) : (
-        <span onClick={createRoomId}>&#127880; Start sharing</span>
-      )}
-    </div>
-  );
-};
+const Share = ({roomId, createRoomId}) => (
+  <div id="share">
+    {roomId ? (
+      <a href={'?' + roomId} target="_blank">
+        &#128279; Share link
+      </a>
+    ) : (
+      <span onClick={createRoomId}>&#127880; Start sharing</span>
+    )}
+  </div>
+);
 ```
 
 We can add this to the top of the left-hand side of the app. For the sake of
@@ -199,7 +197,7 @@ clarity, we remove the undo buttons for now:
 Let's give it this share button some styling to make it prominent for this demo:
 
 ```less
-#room {
+#share {
   a,
   span {
     background: #eee;