[Security] add & update doc entries on AbstractVoter implementation#5423

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javiereguiluz wants to merge 6 commits intosymfony:2.7from

javiereguiluz:pr/4257

Commits on Jun 22, 2015

Commits on Jun 23, 2015

Fixed some typos
javiereguiluz
committed

Commits on Jun 24, 2015

Added a link to the AbstractVoter cookbook
javiereguiluz
committed