man/man3/_Fork.3: Document _Fork()

Signed-off-by: Alejandro Colomar <alx@kernel.org>

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+.\" Copyright, The authors of the Linux man-pages project
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH _Fork 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+_Fork \- create a child process
+.SH LIBRARY
+Standard C library
+.RI ( libc ,\~ \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <unistd.h>
+.P
+.B pid_t _Fork(void);
+.fi
+.SH DESCRIPTION
+This function is equivalent to
+.BR fork (2),
+except that fork handlers registered with
+.BR pthread_atfork (3)
+are not called.
+.SH STANDARDS
+POSIX.1-2024.
+.SH HISTORY
+POSIX.1-2024.
+.SH SEE ALSO
+.BR fork (2),
+.BR vfork (2)