Added a note about case-insensitiveness of service ids#7374

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javiereguiluz wants to merge 2 commits intosymfony:masterfrom

javiereguiluz:fix_7367

Commits on Jan 16, 2017

Added a note about case-insensitiveness of service ids
javiereguiluz
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Commits on Jan 17, 2017

Note -> caution
javiereguiluz
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