Doc: iOS platform notes: Fix missing \endcode command

Task-number: QTBUG-46646
Change-Id: If45a48c4789b8146baeccb2f8c00d56e77793fe0
Reviewed-by: Martin Smith <martin.smith@digia.com>

doc/src/platforms/ios.qdoc

@@ -527,7 +527,7 @@
     \badcode
     <key>UILaunchImageFile</key>
     <string>LaunchImage</string>
-    \badcode
+    \endcode
     The name defaults to \c Default, but qmake generates some of the images, so it is easier to use another name (for example LaunchImage as we did) to avoid clashes.
     \list
         \li LaunchImage.png: 320 x 480