re: Top 5 "over-covered" (read: wrong) Vatican stories of the year

It may have been wrong to say that they are all doctrines.

It is this simple

Dogma unchangeable because Christ himself said it
Doctrine can develop so meaning we can come to a deeper understanding but a doctrine defined by the Church can't be changed only developed. Only the Pope and councils can define these. In Doctrine there are different levels, some are infallible others are not infallible. Birth Control isn't infallible doctrine but the Pope isn't going to change it. Pre Marital sex is a violation of the tenth commandment so that isn't going to change. Same with Gay Marriage. I would say these are dogmas not doctrine.
Discipline changeable and much lower standards.

Dogma is something like Divinity of Christ, etc.
Doctrine are things like Catholic Social Doctrine, certain things of morality, and many other things
Discipline, like married priesthood, lectionary, etc.

It can be hard to know what fits into what category, I don't know everyone.