fixes in user manual

Documentation/User Manual/1-user-interface/C_settings.md

Documentation/User Manual/1-user-interface/H_GBX-Editor.md

Documentation/User Manual/2-calculation-modes/declaration.md

Documentation/User Manual/3-simulation-models/Driver_LAC.md

...User Manual/3-simulation-models/Engine_DynamicFullLoad.md

Documentation/User Manual/3-simulation-models/PwheelInput.md

Documentation/User Manual/4-command-line-arguments/cmd.md

Documentation/User Manual/5-input-and-output-files/CSV.md

Documentation/User Manual/5-input-and-output-files/VDRI.md

Documentation/User Manual/5-input-and-output-files/VGBX.md

Documentation/User Manual/5-input-and-output-files/VTLM.md

Documentation/User Manual/files.txt

Documentation/User Manual/help.html

...s/Engineering Mode/Class5_Tractor_4x2/Class5_Tractor.vveh

VECTO/GUI/VehicleAuxiliariesDialog.vb