Doc: Add the Map Viewer example to the highlighted examples list

Now that Qt Location is a fully-supported module in 5.6, it is
worth highlighting an example that demonstrates the new feature.

Change-Id: I70553f84af5587e3604115684ea1ea75203b91ce
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>

doc/global/manifest-meta.qdocconf

@@ -51,7 +51,8 @@ manifestmeta.highlighted.names      =   "QtQuick/Qt Quick Demo - Same Game" \
                                         "QtQuickDialogs/Qt Quick System Dialog Examples" \
                                         "QtWinExtras/Quick Player" \
                                         "QtMultimedia/QML Video Shader Effects Example" \
-                                        "QtCanvas3D/Planets Example"
+                                        "QtCanvas3D/Planets Example" \
+                                        "QtLocation/Map Viewer (QML)"
 
 manifestmeta.highlighted.attributes =   isHighlighted:true