Add documentation information to pspice symbols
Informs users that these are intended to be used for simulation only.
Will hopefully better protect users from this problem: https://github.com/KiCad/kicad-symbols/issues/418#issuecomment-417090171
Informs users that these are intended to be used for simulation only.
Will hopefully better protect users from this problem: https://github.com/KiCad/kicad-symbols/issues/418#issuecomment-417090171