Doc: link errors

Task-number: QTBUG-34749
Change-Id: I1d107a8700e03ac550fd6611d80a985a36558b22
Reviewed-by: Martin Smith <martin.smith@digia.com>

examples/multimedia/video/doc/src/qmlvideofx.qdoc

@@ -181,8 +181,7 @@ that the divider should be displayed.
 
 The main.qml file shows a
 \l{video/qmlvideofx/qml/qmlvideofx/FileOpen.qml}{FileOpen}, which allows
-the user to select the input source and an
-\l{video/qmlvideofx/qml/qmlvideofx/EffectSelectionPanel.qml}{EffectSelectionPanel}
+the user to select the input source and an EffectSelectionPanel
 item, which lists each of the available shader effects.  As described above, a
 \l{video/qmlvideofx/qml/qmlvideofx/Content.qml}{Content} item is used to load the
 appropriate input and effect type.  A

src/multimedia/doc/src/multimediabackend.qdoc

@@ -71,7 +71,7 @@ classes derived from them.
 
 Consider a developer creating, for example, a media player class called MyPlayer.
 It may have special requirements beyond ordinary media players and so may
-need a custom service and a custom control. We can subclass \l QMediaServiceProvider
+need a custom service and a custom control. We can subclass QMediaServiceProvider
 to create our MyServiceProvider class. Also we will create a
 MyMediaService, and the MyMediaControl to manipulate the media service.
 

src/multimedia/doc/src/qtmultimedia-cpp.qdoc

@@ -38,5 +38,5 @@
     QML alternatives. If your application is serving complex use cases such as
     decoding media files, accessing video or audio buffers, use the C++
     alternative. For more details about the complex audio, video, and camera use
-    cases supported by the C++ classes, refer to \l {Qt Multimedia Overview}.
+    cases supported by the C++ classes, refer to \l {Multimedia}{Multimedia Overview}.
 */