Add documentation for the 2D-quadratic elements visualization functionality

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diff --git a/doc/salome/gui/VISU/input/viewing_3d_presentations.doc b/doc/salome/gui/VISU/input/viewing_3d_presentations.doc
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--- a/doc/salome/gui/VISU/input/viewing_3d_presentations.doc
+++ b/doc/salome/gui/VISU/input/viewing_3d_presentations.doc
@@ -94,6 +94,15 @@ way, revealing its geometry, for example, by applying shadows to the inside regi
 
 \anchor width_opacity_anchor
 <ul>
+<li><b>2D Quadratic</b> - allows to choose the way quadratic elements
+are visualized: as straight lines or as arcs of circles. Also, the
+user can change the properties of quadratic elements visualization
+via Post-Pro module's preferences: representation type (lines/arcs)
+and maximum deviation angle value used by application to build
+arcs.</li>
+
+\image html quadratic.png
+
 <li>\b Properties</li>
 
 \image html viewing13.png