This media standout is doing more than just boosting its payout.Sirius XM Holdings (SIRI) increasing its quarterly distribution rate on Monday seems like a non-event, on the surface. A hike itself isn't a surprise. The satellite radio provider has always boosted its payout at this point of the year since initiating a dividend policy in late 2016.It's also not much of a move. The new quarterly rate of $0.27 a share is just a 1.5% advance. It's certainly welcome to see a dividend move higher at a time when in ...