use the actual function name in .Dt and NAME .Nm, not an alias;

found with mandoc.db(5)

src/lib/libutil/check_expire.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: check_expire.3,v 1.9 2013/08/14 08:39:26 jmc Exp $
+.\"	$OpenBSD: check_expire.3,v 1.10 2014/12/04 18:25:46 schwarze Exp $
 .\"
 .\" Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
 .\"
@@ -14,11 +14,11 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: August 14 2013 $
-.Dt CHECK_EXPIRE 3
+.Dd $Mdocdate: December 4 2014 $
+.Dt LOGIN_CHECK_EXPIRE 3
 .Os
 .Sh NAME
-.Nm check_expire
+.Nm login_check_expire
 .Nd check for password expiration
 .Sh SYNOPSIS
 .In stdio.h