update index.rst
Merge branch 'fix/757' into develop
Close #757

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

* feature/692:
  Typo fix causing formatting problem
  Adding small addendum about collisions in service names
  Adding service naming best practices
Fixed NL typos
Fixed RU typos
fix typo
consistency 'object oriented' should be 'object-oriented'
Fixing zendframework/zf2-documentation#583
Update examples and made the examples clearer
Added documentation for new feature
Merge branch 'overhaul/service-manager' of https://github.com/Ocramius/zf2-documentation into hotfix/#766
Merge branch 'hotfix/#766'
Merge branch 'typo-nl' of https://github.com/pborreli/zf2-documentation into hotfix/#767
Merge branch 'hotfix/#767'
Merge branch 'update/index' of https://github.com/samsonasik/zf2-documentation into hotfix/#765
Merge branch 'hotfix/#765'
Merge branch 'typo-ru' of https://github.com/pborreli/zf2-documentation into hotfix/#768
Merge branch 'hotfix/#768'
Merge branch 'typo2' of https://github.com/samsonasik/zf2-documentation into hotfix/#770