[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: 344cb95d57c36540069e0141926a180693d8882a
masteinhauser/devopsdays-web,joelaha/devopsdays-web,masteinhauser/devopsdays-web,joelaha/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web,benjohnson77/devopsdays-web,joelaha/devopsdays-web,masteinhauser/devopsdays-web,masteinhauser/devopsdays-web