fix markup of controllers guide
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@ -232,7 +232,7 @@ The permitted scalar types are `String`, `Symbol`, `NilClass`,
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`StringIO`, `IO`, `ActionDispatch::Http::UploadedFile` and
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`Rack::Test::UploadedFile`.
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To declare that the value in `params+ must be an array of permitted
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To declare that the value in `params` must be an array of permitted
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scalar values map the key to an empty array:
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```ruby
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