Update docs to service conventions/make it consistent

[wouterj]

The docs are pretty inconsistent in the service configuration (using dot notation, don't using dot notation, prefixing with DI alias, etc.). Everything should be updated to follow the documented naming conventions: http://symfony.com/doc/current/contributing/code/standards.html#service-naming-conventions

[xabbuh]

Well, when talking about application bundles, I'm not sure that they should follow the same naming conventions as for reusable third-party bundles (see #4250).

[wouterj]

Closing, this will be taken over by the update of the docs to best practices