smbfs.5: Us .An -nosplit for the AUTHORS section

Use .An -nosplit for the AUTHORS section, so that
it renders without an unnecessary newline.

No .Dd bump since it isn't a content change.

MFC after:	3 days

share/man/man5/smbfs.5

@@ -64,7 +64,6 @@ Users are advised to evaluate the
 .Pa sysutils/fusefs-smbnetfs
 port instead.
 .Ef
-.Pp
 .Sh SEE ALSO
 .Xr smbutil 1 ,
 .Xr mount_smbfs 8
@@ -90,6 +89,7 @@ The
 device driver first appeared in
 .Fx 4.4 .
 .Sh AUTHORS
+.An -nosplit
 The
 .Nm
 device driver was written by