[Cache] Update cache for 4.2#11391

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Nyholm wants to merge 7 commits intosymfony:masterfrom

Nyholm:grekas-cache

Commits on Apr 9, 2019

Update Cache component doc for 4.2

nicolas-grekas
authored and
Nyholm
committed
Adding examples of cache contracts
Nyholm
committed

Commits on Apr 10, 2019