:neckbeard: Update yaml examples spacing

Consolidate all spacing in example files to be 2-spaced to reduce
potential for malformed configurations.
:neckbeard: provide sane defaults and fix a few typos

Sane defaults should work in most cases - tags are typically optional
and we should provide examples on how they are specified, but not
activate them by default.
Merge pull request #1246 from DataDog/miketheman/yaml

:neckbeard: Update yaml examples spacing