Doc: Fixed random QDoc warnings

- Fixed \snippet paths
- Minor language edits
- Removed unnecessary multiple page commands in a single comment
block. For example, \fn and \qmlsignal in a single comment block
is not allowed. Such instances must be documented in separate
comment blocks.

Change-Id: I65f4518499e2600c4e1807356d4116c575e48c19
Reviewed-by: Andy Nichols <andy.nichols@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

src/imports/multimedia/qdeclarativecamera.cpp

@@ -630,21 +630,18 @@ void QDeclarativeCamera::setDigitalZoom(qreal value)
 */
 
 /*!
-    \fn void QDeclarativeCamera::opticalZoomChanged(qreal zoom)
     \qmlsignal Camera::opticalZoomChanged(zoom)
 
     The optical zoom setting has changed to \a zoom.
 */
 
 /*!
-    \fn void QDeclarativeCamera::digitalZoomChanged(qreal zoom)
     \qmlsignal Camera::digitalZoomChanged(zoom)
 
     The digital zoom setting has changed to \a zoom.
 */
 
 /*!
-    \fn void QDeclarativeCamera::maximumOpticalZoomChanged(qreal zoom)
     \qmlsignal Camera::maximumOpticalZoomChanged(zoom)
 
     The maximum optical zoom setting has changed to \a zoom.  This
@@ -653,7 +650,6 @@ void QDeclarativeCamera::setDigitalZoom(qreal value)
 */
 
 /*!
-    \fn void QDeclarativeCamera::maximumDigitalZoomChanged(qreal zoom)
     \qmlsignal Camera::maximumDigitalZoomChanged(zoom)
 
     The maximum digital zoom setting has changed to \a zoom.  This

src/imports/multimedia/qdeclarativecameraexposure.cpp

@@ -80,15 +80,15 @@ QT_BEGIN_NAMESPACE
 
     For example, to select automatic shutter speed selection:
 
-    \qml
+    \code
         camera.exposure.setAutoShutterSpeed()
-    \endqml
+    \endcode
 
     Or for a specific shutter speed:
 
-    \qml
+    \code
         camera.exposure.manualShutterSpeed = 0.01 // 10ms
-    \endqml
+    \endcode
 
     You can only choose one or the other mode.
 */
@@ -331,7 +331,6 @@ void QDeclarativeCameraExposure::setAutoIsoSensitivity()
 */
 /*!
     \qmlproperty enumeration QtMultimedia5::CameraExposure::exposureMode
-    \property QDeclarativeCameraExposure::exposureMode
 
     This property holds the camera exposure mode.
 
@@ -402,7 +401,6 @@ void QDeclarativeCameraExposure::setSpotMeteringPoint(const QPointF &point)
 */
 /*!
     \qmlproperty enumeration QtMultimedia5::CameraExposure::meteringMode
-    \property QDeclarativeCameraExposure::meteringMode
 
     This property holds the camera metering mode (how exposure is balanced).