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Fix value axis documentation...
Fix value axis documentation QML documentation does not show obsolete properties correctly. Removed the obsolete key and added a deprecated comment. Related typos fixed. Change-Id: I86c862e4f587541df0a08363834ad13efc14e1b4 Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>

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/*!
\example examples/zoomlinechart
\title Zoom Line Example
\subtitle
The example shows how to create your own custom zooming effect with QRubberBand by using a mouse
and how to use touch gestures for paning and zooming.
\image examples_zoomlinechart1.png
\image examples_zoomlinechart2.png
Let's first create a line series with some example data.
\snippet ../examples/zoomlinechart/main.cpp 1
Then we create a custom chart view by deriving from QChartView:
\snippet ../examples/zoomlinechart/chartview.h 1
We override mouse and key event handling
\snippet ../examples/zoomlinechart/chartview.h 2
Then we implement a custom logic for mouse and key events. For example pressing the '+' key will zoom in and pressing
the '-' key will zoom out.
\snippet ../examples/zoomlinechart/chartview.cpp 1
We also create our own QChart:
\snippet ../examples/zoomlinechart/chart.h 1
Where we can handle the gestures:
\snippet ../examples/zoomlinechart/chart.cpp 1
Note that you will need to call grabGesture() to both QMainWindow and QChart.
*/