[DI] Add section about service locators#7458

Merged

javiereguiluz merged 3 commits intosymfony:masterfrom

chalasr:service-locator

May 4, 2017

Commits on Apr 12, 2017

[DI] Add section about Service Locators
chalasr
committed

Commits on Apr 28, 2017

Rewords
javiereguiluz
authored

Commits on May 3, 2017

Fix service locator declaration
chalasr
committed