rt_sigqueueinfo() now has its own manual page, so should not
be listed in the .TH line of this page.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Now that the underlying system call rt_sigqueueinfo(2) is
properly documented, move sigqueue() to Section 3, since
it is really a library function.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>