score:11
An onward ticket means a ticket out of Doha, which you obviously have.
Airlines don't care about whether you have a return ticket or not. What they care about is whether you have the valid paperwork to enter your destination country - otherwise they can be fined and be held responsible for returning you to where you came from.
In your case, that would mean that they will check that you meet the requirements to enter India. If entering India required a return ticket (which for some people it does) then the airline would enforce that - but as you've said you do not need a return flight to enter India, then Qatar will not enforce that you need one.