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>

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

@@ -0,0 +1,43 @@
+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 multimedia/video/snippets/frequencymonitor/frequencymonitor.h
+\skipto class FrequencyMonitor : public QObject
+\printuntil Q_OBJECT
+\skipto Q_PROPERTY(qreal instantaneousFrequency
+\printuntil averageFrequencyChanged)
+\skipto public
+\printuntil :
+\dots
+\skipto static void qmlRegisterType
+\printuntil ;
+\skipto public slots
+\printuntil notify();
+\skipto };
+\printline };
+
+The FrequencyMonitor class is exposed to QML like this
+
+\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 multimedia/video/snippets/frequencymonitor/qml/frequencymonitor/FrequencyItem.qml
+\skipto import FrequencyMonitor
+\printuntil id: root
+\dots
+\skipto function notify
+\printuntil id: monitor
+\skipto onAverageFrequencyChanged
+\printuntil {
+\skipto averageFrequencyText
+\printuntil /^\}/
+
+The result looks like this:
+
+\image video-qml-paint-rate.png
+
+