Fix typo (#2379)

Removed duplicate "the"

docs/source/tutorial/tutorial-query-ui.md

@@ -144,7 +144,7 @@ Build and run the application. After the query completes, a list of launch sites
 
 <img src="images/list_sites_success.png" alt="List of launch sites" class="screenshot" width="300"/>
 
-However, if you attempt to tap one of the rows, the app displays the detail with the the placeholder text you can see in the storyboard, instead of any actual information about the launch:
+However, if you attempt to tap one of the rows, the app displays the detail view controller with the placeholder text you can see in the storyboard, instead of any actual information about the launch:
 
 
 <img src="images/stock_detail_view.png" alt="Placeholder detail content" class="screenshot" width="300"/>
@@ -297,4 +297,4 @@ Build and run the application, and you will see all the information for current
 
 If you scroll down, you'll see the list includes only about 20 launches. This is because the list of launches is **paginated**, and you've only fetched the first page. 
 
-Now it's time to learn [how to use a cursor-based loading system to load the entire list of launches](./tutorial-pagination/).
+Now it's time to learn [how to use a cursor-based loading system to load the entire list of launches](./tutorial-pagination/).