Added missing quote in grouped_options_for_select example
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@ -427,7 +427,7 @@ module ActionView
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#
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# Sample usage (Hash):
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# grouped_options = {
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# 'North America' => [['United States','US], 'Canada'],
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# 'North America' => [['United States','US'], 'Canada'],
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# 'Europe' => ['Denmark','Germany','France']
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# }
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# grouped_options_for_select(grouped_options)
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