Explain the limitations of the custom messages in UniqueEntity#6932

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javiereguiluz wants to merge 4 commits intosymfony:2.8from

javiereguiluz:fix_6929

Commits on Aug 30, 2016

Commits on Aug 31, 2016

Minor reword to be more concise
javiereguiluz
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Commits on Oct 4, 2016

Added the versionadded directive
javiereguiluz
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