pam_pkcs11(8) references non-existent pam_pkcs11.conf(5)

The manpage pam_pkcs11(8) contains:
```
.SH "SEE ALSO"
.BR pam (8),
.BR pam_pkcs11.conf (5),
```
But there is no pam_pkcs11.conf(5) manpage.

But reported on Debian https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1074245
" pam_pkcs11 manpage has no useful information and referes to non-existing pam_pkcs11.conf "