Docs: Add stereoscopic example to OpenGL examples

This fix uses the \ingroup command to add the stereoscopic example to the
examples-widgets-opengl group.

I also elaborated on the hardware requirements.

Fixes: QTBUG-119280
Pick-to: 6.5 6.6
Change-Id: I6d5b992e533b897d84100f0f897aae97ef89290f
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 10 insertions, 5 deletions

diff --git a/examples/opengl/doc/src/stereoqopenglwidget.qdoc b/examples/opengl/doc/src/stereoqopenglwidget.qdoc
index 6037d370df..f9e230af63 100644
--- a/examples/opengl/doc/src/stereoqopenglwidget.qdoc
+++ b/examples/opengl/doc/src/stereoqopenglwidget.qdoc
@@ -5,8 +5,16 @@
     \example stereoqopenglwidget
     \title QOpenGLWidget Stereoscopic Rendering Example
     \examplecategory {Graphics & Multimedia}
-    \brief This example shows how to create a minimal QOpenGLWidget based application
-    with stereoscopic rendering support.
+    \ingroup examples-widgets-opengl
+    \brief This example shows how to create a minimal QOpenGLWidget based
+    application with stereoscopic rendering support.
+
+    \note Support for stereoscopic rendering has certain hardware requirements,
+    such as, a graphics card with stereo support, 3D glasses and specific
+    monitors.
+
+    \note This example renders two images to two separate buffers. When you
+    view the images through 3D glasses, they give a 3D holographic effect.
 
     \image stereoexample-leftbuffer.png
 
@@ -16,9 +24,6 @@
 
     The above image is what will be rendered to the right buffer.
 
-    \note Support for stereoscopic rendering has certain hardware requirements, like
-    your graphics card needs stereo support.
-
     \section1 Setting the correct surface flag
     To enable stereoscopic rendering you need to set the flag
     QSurfaceFormat::StereoBuffers globally. Just doing it on the widget is not enough