Fix possible error in "disable_advanced_gui" flag's description

SConstruct

@@ -164,7 +164,7 @@ opts.Add('extra_suffix', "Custom extra suffix added to the base filename of all
 opts.Add(BoolVariable('vsproj', "Generate a Visual Studio solution", False))
 opts.Add(EnumVariable('macports_clang', "Build using Clang from MacPorts", 'no', ('no', '5.0', 'devel')))
 opts.Add(BoolVariable('disable_3d', "Disable 3D nodes for a smaller executable", False))
-opts.Add(BoolVariable('disable_advanced_gui', "Disable advanced 3D GUI nodes and behaviors", False))
+opts.Add(BoolVariable('disable_advanced_gui', "Disable advanced GUI nodes and behaviors", False))
 opts.Add(BoolVariable('no_editor_splash', "Don't use the custom splash screen for the editor", False))
 opts.Add('system_certs_path', "Use this path as SSL certificates default for editor (for package maintainers)", '')