Document :allow_nil option for validates_acceptance_of since it defaults to...
Document :allow_nil option for validates_acceptance_of since it defaults to true. Closes #8050. [tzaharia] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6687 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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