Added description for the "validation_groups" option#10514

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stollr wants to merge 3 commits intosymfony:2.8from

stollr:form_validation_groups

Commits on Nov 15, 2018

Added description for the "validation_groups" option
naitsirch
committed
Added doc about usage of GroupSequence and links to related articles for form option 'validation_groups'
naitsirch
committed
Some improvements on validation_groups option
naitsirch
committed