lib/libcam/cam_cdbparse.3: fix manpage warnings

• Add comma before and after 'e.g.'; remove surrounding parentheses that were unnecessary after this change [1].
• Add .Mt when referencing ken and Peter Dufault's email addresses [2].
• Sprinkle around .An use where proper [2].

Bump .Dd for the change

MFC after: 1 week
Reported by: igor [1], manlint [2]
Reviewed by: imp
Sponsored by: Dell EMC Isilon
Differential Revision: D9968