[DC 2016] "Washington, D.C." -> "Washington, DC"
[DC 2016] "Washington, D.C." -> "Washington, DC"

Prevailing local style is not to use periods in DC.


Former-commit-id: 58b8d8650f8387848b84bf8766d85930b2ee5d30
gomex/devopsdays-web,gomex/devopsdays-web,gomex/devopsdays-web,gomex/devopsdays-web