Minor typo fixes, slight restructuring of small sections, etc.  

Happy to offer supporting arguments for any of the changes, but I think they're generally pretty straightforward.  General themes include:

- Minor typos
- Original had mixed usage of "time series" and "timeseries".  Standardized on "time series" (since the latter isn't a word).
- Minor restructuring where exception behaviors were addressed before default behaviors were fully described.
- A slight shift in voice from very casual to "business casual"

I was reading the docs anyway, so figured I'd lend a hand along the way.  Hope this works for you...

Thanks -

Shane O.