Added the documentation of the PropertyInfo component#6047

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javiereguiluz wants to merge 3 commits intosymfony:2.8from

javiereguiluz:pr/5717

Commits on Sep 22, 2015

[PropertyInfo] Add the doc
dunglas
committed

Commits on Oct 6, 2015

Sync with the merged version
dunglas
committed

Commits on Dec 18, 2015

Finish the documentation of PropertyInfo
javiereguiluz
committed