issue-13589: adjust docs for custom-false-values for checkbox type#9031

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leberknecht wants to merge 6 commits intosymfony:4.1from

leberknecht:issue-13589-allow-custom-false-values-for-checkboxtype

Commits on Jan 10, 2018

issue-13589: adjust docs for custom-false-values for checkbox type, refs #13589 on symfony
leberknecht
committed

Commits on Jan 18, 2018

adding false_values option to checkbox-type docs
leberknecht
committed