Doc: Updated the \brief statements

Most of them were unnecessarily long.

Change-Id: I8942254c2211adb268e399056435e6acc940616f
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

examples/multimedia/audiodevices/doc/src/audiodevices.qdoc

@@ -29,12 +29,11 @@
     \example audiodevices
     \title Audio Devices Example
     \ingroup multimedia_examples
-    \brief The Audio Devices example shows the application of the audio devices
-    APIs.
+    \brief Testing the available audio devices and their configuration.
 
-    This example shows how to create a simple application to list and test
-    the configuration for the various audio devices available on the device
-    or machine. This is done using the QtMobility Multimedia API.
+    \e{Audio Devices} demonstrates how to create a simple application to list
+    and test the configuration for the various audio devices available on the
+    target device or desktop PC.
 
     \image audiodevices.png
 

examples/multimedia/audioengine/doc/src/audioengine.qdoc

@@ -29,10 +29,9 @@
     \example audioengine
     \title AudioEngine Example
     \ingroup multimedia_examples
-    \brief The Audio Engine example demonstrates 3D sound control using
-    the Qt Audio Engine API.
+    \brief Enabling 3D sound control using the Qt Audio Engine API.
 
-    The Audio Engine example demonstrates 3D sound control using the
+    \e{Audio Engine} demonstrates 3D sound control using the
     \l{Qt Audio Engine QML Types}{Qt Audio Engine} API.
 
     \include examples-run.qdocinc

examples/multimedia/audioinput/doc/src/audioinput.qdoc

@@ -29,8 +29,9 @@
     \example audioinput
     \title Audio Input Example
     \ingroup multimedia_examples
-    \brief The Audio Input Example shows the use of the QAudioInput class.
-    The example demonstrates the basic use cases of the QAudioInput class.
+    \brief Recording audio using the QAudioInput class
+
+    \e{Audio Input} demonstrates the basic use cases of QAudioInput.
 
     \image audioinput-example.png
 

examples/multimedia/audiooutput/doc/src/audiooutput.qdoc

@@ -29,10 +29,9 @@
     \example audiooutput
     \title Audio Output Example
     \ingroup multimedia_examples
-    \brief The Audio Output Example show the use of the QAudioOutput API.
+    \brief Enabling audio playback using the QAudioOutput class.
 
-    The example demonstrates the basic use cases of the QAudioOutput class from
-    \l{Qt Multimedia}.
+    \e{Audio Output} demonstrates the basic use cases of QAudioOutput.
 
     \image audiooutput-example.png
 

examples/multimedia/audiorecorder/doc/src/audiorecorder.qdoc

@@ -29,10 +29,10 @@
     \example audiorecorder
     \title Audio Recorder Example
     \ingroup multimedia_examples
-    \brief The Audio Recorder Example shows how to create a simple audio recorder.
+    \brief Discovering the available devices and supported codecs.
 
-    It demonstrates the discovery of the supported devices and codecs and the use
-    of recording functions in the QAudioRecorder class.
+    \e{Audio Recorder} demonstrates how to identify the available devices and
+    supported codecs, and the use of QAudioRecorder class.
 
     \image audiorecorder.png
 

examples/multimedia/spectrum/doc/src/spectrum.qdoc

@@ -29,10 +29,11 @@
     \example spectrum
     \title Spectrum Example
     \ingroup multimedia_examples
-    \brief The Spectrum Example uses a combination multimedia APIs to process microphone input.
+    \brief Analyzing a raw audio stream using the FFTReal library.
 
-    The Spectrum Analyzer example shows how the \l{Qt Multimedia} module can be
-    used to record and then play back an audio stream.
+    \e Spectrum demonstrates how the \l{Qt Multimedia} module can be used to
+    analyze an audio stream while recording it, and also play the recorded
+    stream.
 
     \image spectrum-demo.png
 

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

@@ -29,13 +29,11 @@
 \example video/qmlvideo
 \title QML Video Example
 \ingroup multimedia_examples
+\brief Transforming video and camera viewfinder content.
 
-\brief The QML Video Example demonstrates the various manipulations (move;
-resize; rotate; change aspect ratio) which can be applied to QML \l{VideoOutput}
-items.
-
-This example demonstrates the various manipulations (move; resize; rotate;
-change aspect ratio) which can be applied to QML \l{VideoOutput} items.
+\e{QML Video} demonstrates the various transformations (move; resize; rotate;
+change aspect ratio) that can be applied to QML \l VideoOutput and \l Camera
+types.
 
 It also shows how native code can be combined with QML to implement more
 advanced functionality - in this case, C++ code is used to calculate the QML

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

@@ -30,23 +30,21 @@
 \title QML Video Shader Effects Example
 \ingroup multimedia_examples
 
-\brief The QML Video Shader Effects Example shows how \l {ShaderEffect}
-can be used to apply postprocessing effects, expressed in \c GLSL, to video
-and camera viewfinder content.
+\brief Applying shader effects on video and camera viewfinder content.
 
 \include examples-run.qdocinc
 
 \section1 Overview
 
-This example shows how a \l {ShaderEffect} can be used to apply
-postprocessing effects, expressed in GLSL, to QML \l {VideoOutput} items.
+\e{QML Video Shader Effects} demonstrates how a \l ShaderEffect can be used to
+apply postprocessing effects, expressed in GLSL, to QML \l VideoOutput type.
 
 It also shows how native code can be combined with QML to implement more
 advanced functionality - in this case, C++ code is used to calculate the QML
 frame rate.  This value is rendered in QML in a semi-transparent item
 overlaid on the video content.
 
-The following screenshots show shader effects being applied.  In each case,
+The following screenshots show shader effects being applied. In each case,
 the effect is implemented using a fragment shader.
 
 Here we see an edge detection algorithm being applied to a video clip