Update policy-docs.md
Update policy-docs.md

Adds PowerPoint to USAID open data policy presentation delivered on 10/21/2014
portofsandiego/project-open-data.github.io,portofsandiego/project-open-data.github.io,pjdufour/project-open-data.github.io,bpushed/project-open-data.github.io,pjdufour/project-open-data.github.io,pjdufour/project-open-data.github.io,bpushed/project-open-data.github.io,portofsandiego/project-open-data.github.io,portofsandiego/project-open-data.github.io,pjdufour/project-open-data.github.io