Documentation typo

```
What steps will reproduce the problem?
1.go to https://code.google.com/p/cefpython/wiki/BuildOnWindows
2.find this line: make_distrib.bat --alow-partial

change --alow-partial
to --allow-partial
```

Original issue reported on code.google.com by `suns...@deliveryherochina.com` on 15 Oct 2013 at 6:45
