auth_openidc.conf: record that default token binding policy is optional
auth_openidc.conf: record that default token binding policy is optional

Signed-off-by: Hans Zandbelt <ed0aee6a22215d4e183b63ab4a45da7fb897917a@zmartzone.eu>
pingidentity/mod_auth_openidc,pingidentity/mod_auth_openidc