Merge branch 'fix/757'
Close #757

* fix/757:
  Fixed spanish typos
Adding example code to the service manager introduction
Merge branch 'feature/692'
Close #692

* feature/692:
  Typo fix causing formatting problem
  Adding small addendum about collisions in service names
  Adding service naming best practices
Merge branch 'overhaul/service-manager' of https://github.com/Ocramius/zf2-documentation into hotfix/#766
Merge branch 'hotfix/#766' into develop