man/*.man: Replace minus sign with hyphen: `\-' with `-'.

man/*.man: Replace minus sign with hyphen: `\-' with `-'.

Conservatively changed many of the troff minus-signs, `\-', with a troff
hyphen, `-'.  Where it wasn't quickly obviously, I left it unchanged.
There were also cases that shouldn't be either minus sign or hyphen.
Those were changed to hyphen and still need to be fixed properly.