Tweak upgrade steps

I took a stab at tweaking the upgrade steps a bit. See:
![screen shot 2014-11-15 at 15 41 52](https://cloud.githubusercontent.com/assets/162976/5056973/2c25023e-6cdf-11e4-99d8-2e00383129aa.png)
![screen shot 2014-11-15 at 15 41 57](https://cloud.githubusercontent.com/assets/162976/5056974/2cea36b2-6cdf-11e4-8fbf-e78ce38702e2.png)

Run on sentences don't read more casually to me.  IMO, it sounds uneducated and sloppy.  For me, it's a bit like listening to music that's out-of-tune...it grates on me to the point where I pay more attention to the fact that a run-on-sentence was used than to the point the author is trying to make.

While I can't say how much of our audience will have a similar reaction, it's going to be a distraction for at least some portion of the audience.

You can just change the comma to a period or semicolon if you really don't want to add a connecting word like "as".