macOS SolveSpace has the Help menu but it lacks the About menu item in it and instead the way to find the SolveSpace version is to go to SolveSpace > About SolveSpace. This PR updates the issue template to show that.
I have also replaced the `...` with an ellipsis (`…`) as it IMO looks better (can revert this if it doesn't match the menu item on Windows/Linux) and updated the example version to the current SolveSpace version.