[BrowserKit] fix return type declarations
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@ -141,9 +141,9 @@ abstract class Client
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* Gets single server parameter for specified key.
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*
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* @param string $key A key of the parameter to get
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* @param string $default A default value when key is undefined
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* @param mixed $default A default value when key is undefined
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*
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* @return string A value of the parameter
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* @return mixed A value of the parameter
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*/
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public function getServerParameter($key, $default = '')
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{
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