I should read more than a sentence at a time when I'm correcting typos—sorry for the typo correction spam ;)

rules are avaialble at https://en.wikipedia.org/wiki/Wikipedia:AutoWikiBrowser/Typos

The current version mentions nothing about chmod +x'ing the rax.py file, which means you get a really weird error message when you try to follow it:

```
raise ValueError, "No closing quotation"
```

... from deep inside shlex.py. I'm sure that makes sense if you realized that meant that it was trying to parse `rax.py` as an ini file...

Also note AWX is named "Tower" now, as we found that simpler.

Some minor tweaks to make things a little more tutorial-like, moved credentials section up higher, etc.