[HttpFoundation] Fix getClientIp @return docblock
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@ -850,7 +850,7 @@ class Request
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* ("Client-Ip" for instance), configure it via "setTrustedHeaderName()" with
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* the "client-ip" key.
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*
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* @return string The client IP address
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* @return string|null The client IP address
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*
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* @see getClientIps()
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* @see http://en.wikipedia.org/wiki/X-Forwarded-For
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