[ATD] 2 references

reference/capacity-building-model.md:156

| [ATD](https://www.td.org/education/courses-by-role/trainer) | Training & Facilitation Certificate (virtual, multi-session) | $1,995 - $2,245/person | Member/non-member |

reference/capacity-building-model.md:174

| [ATD](https://www.td.org/education-courses/atd-master-trainer-program) | Master Trainer (advanced cert) | $1,995 - $2,245 | Member/non-member |