couple comment style fixes

fixes for:

![image](https://cloud.githubusercontent.com/assets/960919/4441760/a88280d2-47d6-11e4-8a4c-ddc2940d65c8.png)

and

![image](https://cloud.githubusercontent.com/assets/960919/4441764/b1a3ba96-47d6-11e4-9382-846b9723bac2.png)

i want to continually nudge for spaces around sass operators til i'm told to stop :wink: 

means that hyphens in names can't be confused with minus operator e.g. 

```scss
($gs-baseline / 3) * 5
``` 
you'd _have_ to that with a subtraction anyway. that said, def not a blocker