docs(react): add default Tab2

Author: thetaPC

docs/react/your-first-app/2-taking-photos.md

@@ -261,6 +261,8 @@ const Tab2: React.FC = () => {
     </IonPage>
   );
 };
+
+export default Tab2;
 ```
 
 Within the web browser, click the camera button and take another photo. This time, the photo is displayed in the Photo Gallery!

docs/react/your-first-app/7-live-reload.md

@@ -156,6 +156,8 @@ const Tab2: React.FC = () => {
     </IonPage>
   );
 };
+
+export default Tab2;
 ```
 
 Add a click handler to the `<IonImg>` element. When the app user taps on a photo in our gallery, we’ll display an [Action Sheet](../../api/action-sheet.md) dialog with the option to either delete the selected photo or cancel (close) the dialog.

versioned_docs/version-v7/react/your-first-app/2-taking-photos.md

@@ -261,6 +261,8 @@ const Tab2: React.FC = () => {
     </IonPage>
   );
 };
+
+export default Tab2;
 ```
 
 Within the web browser, click the camera button and take another photo. This time, the photo is displayed in the Photo Gallery!

versioned_docs/version-v7/react/your-first-app/7-live-reload.md

@@ -156,6 +156,8 @@ const Tab2: React.FC = () => {
     </IonPage>
   );
 };
+
+export default Tab2;
 ```
 
 Add a click handler to the `<IonImg>` element. When the app user taps on a photo in our gallery, we’ll display an [Action Sheet](../../api/action-sheet.md) dialog with the option to either delete the selected photo or cancel (close) the dialog.