Reworded the note about dump() availability per environment#8967

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javiereguiluz wants to merge 2 commits intosymfony:2.7from

javiereguiluz:fix_8731

Commits on Jan 3, 2018

Reworded the note about dump() availability per environment
javiereguiluz
committed

Commits on Jan 4, 2018

Minor fixes
javiereguiluz
committed