github: What to do when unittests fail?

[Andrej Mitrovic]

These two were from ddoc. They're just typo's that were fixed, simple
to review and merge with master.

But I might have gone overkill with the DPL.org pull request:
https://github.com/D-Programming-Language/d-programming-language.org/pull/9

For that one most errors that were fixed were just code sample typo's,
but in other instances I've added some missing documentation (they're
rather small additions). I hope it's not too much for a pull request,
otherwise I'll have to figure out how to separate them into multiple
pull requests.