Add doc string for public methods about marathon-consul

[dankraw]

Some (few) of the points are relevant, but imho adding that number of comments won't make our code any better. "Every time you write a comment, you should grimace and feel the failure of your ability of expression." I don't think we should blindly follow these rules, we're not a lib. :)

But if that tool can be configured to somehow filter/skip those "should have comment" warnings, that could be helpful though.

[janisz]

I agree but this should encourage us to double check if specific method/field really need to be public

[wendigo]

👍