mutex.9: add a small detail to the history section
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.\" $NetBSD: mutex.9,v 1.34 2022/12/19 00:41:45 uwe Exp $
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.\" $NetBSD: mutex.9,v 1.35 2023/02/01 03:27:45 gutteridge Exp $
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.\"
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.\" Copyright (c) 2007, 2009 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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@ -314,3 +314,6 @@ code must provide to support mutexes.
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.Sh HISTORY
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The mutex primitives first appeared in
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.Nx 5.0 .
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.Fn mutex_ownable
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first appeared in
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.Nx 8.0 .
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