[Form] Compound option explained#9283

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vudaltsov wants to merge 4 commits intosymfony:2.7from

vudaltsov:form-compound

Commits on Feb 17, 2018

Compound option explained.
vudaltsov
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Commits on Mar 9, 2018

Rewritten.
vudaltsov
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Commits on Mar 13, 2018

Fixed a typo in TextareaType.
vudaltsov
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Commits on Mar 18, 2018

Reformulated the intro, added usage paragraph.
vudaltsov
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