Doc: Delete links to removed examples

The examples have been removed as part of the examples revamp project.
This patch resolves a number of qdoc warnings.

Change-Id: Ie3d2f5637136c631d7e9f7a8ffd93baea52f77d8
Reviewed-by: Kai Köhne <kai.koehne@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 132be307fff049e83ba8b93733fc571c0c45469b)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/gui/image/qicon.cpp

@@ -637,8 +637,6 @@ QFactoryLoader *qt_iconEngineFactoryLoader()
     │       └── appointment-new.png
     └── index.theme
   \endcode
-
-  \sa {Icons Example}
 */
 
 

src/gui/image/qimage.cpp

@@ -616,8 +616,8 @@ bool QImageData::checkForAlphaPixels() const
 
     \endtable
 
-    \sa QImageReader, QImageWriter, QPixmap, QSvgRenderer, {Image Composition Example},
+    \sa QImageReader, QImageWriter, QPixmap, QSvgRenderer,
-        {Image Viewer Example}, {Scribble Example}, {Pixelator Example}
+        {Image Composition Example}, {Scribble Example}
 */
 
 /*!

src/gui/image/qmovie.cpp

@@ -53,7 +53,7 @@
 
     Call supportedFormats() for a list of formats that QMovie supports.
 
-    \sa QLabel, QImageReader, {Movie Example}
+    \sa QLabel, QImageReader
 */
 
 /*! \enum QMovie::MovieState

src/gui/kernel/qdrag.cpp

@@ -64,7 +64,7 @@ QT_BEGIN_NAMESPACE
     required.
 
     \sa {Drag and Drop}, QClipboard, QMimeData, {Draggable Icons Example},
-        {Draggable Text Example}, {Drop Site Example}, {Fridge Magnets Example}
+        {Draggable Text Example}, {Drop Site Example}
 */
 
 /*!

src/gui/text/qfont.cpp

@@ -540,7 +540,7 @@ QFontEngineData::~QFontEngineData()
     Information on encodings can be found from the
     \l{UTR17} page.
 
-    \sa QFontMetrics, QFontInfo, QFontDatabase, {Character Map Example}
+    \sa QFontMetrics, QFontInfo, QFontDatabase
 */
 
 /*!

src/gui/text/qfontdatabase.cpp

@@ -1201,7 +1201,7 @@ QString QFontDatabase::styleString(const QFontInfo &fontInfo)
     each combination of family and style, displaying this information
     in a tree view.
 
-    \sa QFont, QFontInfo, QFontMetrics, {Character Map Example}
+    \sa QFont, QFontInfo, QFontMetrics
 */
 
 /*!

src/gui/text/qfontmetrics.cpp

@@ -91,7 +91,7 @@ extern void qt_format_text(const QFont& font, const QRectF &_r,
     Example:
     \snippet code/src_gui_text_qfontmetrics.cpp 0
 
-    \sa QFont, QFontInfo, QFontDatabase, {Character Map Example}
+    \sa QFont, QFontInfo, QFontDatabase
 */
 
 /*!