Doc: Moved the qdocinc and image to the sourcedirs

QDoc parses the \input command relative to the sourcedirs
and not exampledirs. So I had to move the qdocinc file and
the corresponding image to the sourcedirs.

Task-number: QTBUG-28727
Change-Id: Ie064f0b79ab8ffcb0587b43ff4508f5865a321a9
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

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

@@ -129,13 +129,13 @@ instance, the embedded
 
 \section1 Calculating and displaying QML painting rate
 
-\input video-qml-paint-rate.qdocinc
+\input multimedia/doc/src/examples/video-qml-paint-rate.qdocinc
 
 All that remains is to connect the afterRendering() signal of the QQuickView
 object to a JavaScript function, which will eventually call frequencyItem.notify():
 
 \quotefromfile multimedia/video/qmlvideo/main.cpp
-\skipto QmlApplicationViewer
+\skipto QGuiApplication
 \printuntil ;
 \dots
 \skipto QQuickItem

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

@@ -203,13 +203,13 @@ And here is the effect selection menu:
 
 \section1 Calculating and displaying QML painting rate
 
-\input video-qml-paint-rate.qdocinc
+\input multimedia/doc/src/examples/video-qml-paint-rate.qdocinc
 
 All that remains is to connect the afterRendering() signal of the QQuickView
 object to a JavaScript function, which will eventually call frequencyItem.notify():
 
 \quotefromfile multimedia/video/qmlvideofx/main.cpp
-\skipto QmlApplicationViewer
+\skipto QGuiApplication
 \printuntil ;
 \dots
 \skipto QQuickItem

src/multimedia/doc/src/examples/video-qml-paint-rate.qdocinc

@@ -2,7 +2,7 @@ The QML painting rate is calculated by the FrequencyMonitor class, which
 turns a stream of events (received via the notify() slot), into an
 instantaneous and an averaged frequency:
 
-\quotefromfile video/snippets/frequencymonitor/frequencymonitor.h
+\quotefromfile multimedia/video/snippets/frequencymonitor/frequencymonitor.h
 \skipto class FrequencyMonitor : public QObject
 \printuntil Q_OBJECT
 \skipto Q_PROPERTY(qreal instantaneousFrequency
@@ -19,13 +19,13 @@ instantaneous and an averaged frequency:
 
 The FrequencyMonitor class is exposed to QML like this
 
-\quotefromfile video/snippets/frequencymonitor/frequencymonitordeclarative.cpp
+\quotefromfile multimedia/video/snippets/frequencymonitor/frequencymonitordeclarative.cpp
 \skipto FrequencyMonitor::qmlRegisterType
 \printuntil }
 
 and its data is displayed by defining a QML item called FrequencyItem, like this:
 
-\quotefromfile video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml
+\quotefromfile multimedia/video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml
 \skipto import FrequencyMonitor
 \printuntil id: root
 \dots