Updated "Checking for Roles inside a Voter" for 2.8#7524

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javiereguiluz wants to merge 2 commits intosymfony:2.8from

javiereguiluz:fix_21701_1

Commits on Feb 23, 2017

Updated "Checking for Roles inside a Voter" for 2.8
javiereguiluz
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Commits on Oct 29, 2017

Removed a wrong help note
javiereguiluz
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