[Piglit] Update some docstrings v2

[Dylan Baker]

[snip]
> > I'll throw a patch at the end of the series, do you want me to send 

I'm gonna take it back, sorry. I don't know that dmesg-warn should be 
worse than warn, (same for fail) since pass -> dmesg-warn, warn -> 
dmesg-fail, and fail -> dmesg-fail. Personally I was never a fan of having 
special dmesg- statuses, I feel that a fail is a fail and warn is a warn, but 
I'm not sure that change is correct.
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