feat: Added NetBSD man pages

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+.\"     $NetBSD: delay.9,v 1.8 2021/05/31 12:24:15 simonb Exp $
+.\"
+.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Gregory McGarry.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd July 20, 2011
+.Dt DELAY 9
+.Os
+.Sh NAME
+.Nm delay ,
+.Nm DELAY
+.Nd microsecond delay
+.Sh SYNOPSIS
+.In sys/param.h
+.Ft void
+.Fn delay "unsigned int us"
+.Ft void
+.Fn DELAY "unsigned int us"
+.Sh DESCRIPTION
+Wait approximately
+.Fa us
+microseconds.
+.Pp
+The delay is implemented as a machine loop, preventing events other than
+interrupt handlers for unmasked interrupts to run.
+.Fn DELAY
+is reentrant (doesn't modify any global kernel or machine state) and is
+safe to use in interrupt or process context.
+.Pp
+For long delays, condition variables
+should be considered, however they can only be used from process context
+and their resolution is limited by the system clock frequency.
+.Sh SEE ALSO
+.Xr condvar 9 ,
+.Xr hz 9 ,
+.Xr kpause 9