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Thanks for filing the patch there! I didn't know, that optparse is developt outside of Python...
Anyway I think you're right not to comment the whole api. I did not intend that. I would be content with a little note in the docs quickly explains OptionGroups and how to create them. More shouldn't be told, since they are only useful for formatting help output.
I just needed such a thing for my recent project and was short of overwriting the OptionParser and HelpFormatter classes. For that purpose I looked into the sources, where I found the OptionGroup capabilities. A little note would have shortened the development of the option parsing code quite a bit... ;)