Use the new Security helper in some code examples#9847

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javiereguiluz wants to merge 3 commits intosymfony:3.4from

javiereguiluz:fix_8437

Commits on May 28, 2018

Use the new Security helper in some code examples
javiereguiluz
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Replaced AuthorizationCheckerInterface by Security when possible
javiereguiluz
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Commits on Jun 1, 2018

Reverted a change
javiereguiluz
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