Docs: Fix "Can't link to" example warnings

Task-number: QTBUG-113160
Pick-to: 6.5
Change-Id: I49de891c36d778df5d2727f2f0703d534421e2d5
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>

src/qml/doc/src/qmllanguageref/syntax/objectattributes.qdoc

@@ -621,10 +621,22 @@ This is because the default property of \l Item is its \c data property, and
 any items added to this list for an \l Item are automatically added to its
 list of \l {Item::children}{children}.
 
-Default properties can be useful for reassigning the children of an item. See
-the \l{TabWidget Example}, which uses a default property to
-automatically reassign children of the TabWidget as children of an inner
-ListView.  See also \l {Extending QML}.
+Default properties can be useful for reassigning the children of an item.
+For example:
+
+\qml
+Item {
+    default property alias content: inner.children
+
+    Item {
+        id: inner
+     }
+}
+\endqml
+
+By setting the default property \e alias to \c {inner.children}, any object
+assigned as a child of the outer item is automatically reassigned as a child
+of the inner item.
 
 \section3 Required Properties
 

src/quick/doc/src/examples.qdoc

@@ -102,7 +102,6 @@ Creator.
         \li \l{Calendar Example}
         \li \l{tableview/gameoflife}{TableView}
         \li \l{Qt Quick Examples - Text}{Text and Fonts}
-        \li \l{Qt Quick Examples - Toggle Switch}{Custom Toggle Switch}
         \endlist
     \enddiv
     \div {class="doc-column"}